Anti-depression diet

Author: Andre Adrian
Date: 10.Jul.2011

Introduction

The brain-gut axis

What is depression? At the moment nobody can answer this question completly. Today the standard treatment for depression is a SSRI drug like Prozac. This Serotonin Reuptake Inhibitor allows the brain to better use the existing neurotransmitter serotonin. Make good use of the little serotonin there is makes sense if depression is a lack of serotonin in the brain. Increase the amount of serotonin in the brain is a better method. Serotonin is produced in the brain out of tryptophan, which is an essential nutrient. The body can not produce tryptophan, but has to get it from the food. One part of anti-depression treatment via diet is to increase the intake of tryptophan and other "raw materials" that the body needs to produce serotonin.
Most of the body’s serotonin (∼95%) resides in the gut. There, serotonin initiates peristaltic and secretory reflexes and transmits information to the central nervous system. The nerve cells in the gut are competitors to the nerve cells in the brain for tryptophan and other essential nutrients. The second part of the anti-depression diet is to direct the essential nutrients to the brain cells. Lack of serotonin in the brain is a result of conditions in the gut. Coeliac disease, lactose intolerance, fructose malabsorption and sorbitol intolerance are ailments that influce the gut. Via the brain-gut axis the gut ailments become brain ailments.
This depression treatment via diet has a two part strategy. First, increase the intake of essential nutrients needed for serotonin production. Second, direct the essential nutrients to the brain cells. This diet will not help you to loose weight, nor shall it increase your weight like SSRI drugs often do. This diet exchanges only part of your daily food intake. It is assumed that one meal per day is consumed while at work or at school. This meal is not part of the diet.

Contents

A sad story
Anti-depression diet
Hunter-gatherer diet
Tryptophan
Eicosapentaenoic acid (EPA)
myo-Inositol
Instant yeast content
Ketamine, Toluene, Nitrus Oxide
Inflammation, Ailments and Depression
Depression and Psoriasis
Depression, a disease of civilization?
Essential nutrient
Literature
About the author

A sad story

WARNING: I am not a doctor of medicine nor do I have any knowledge about the treatment of depression. My aim is to bring together available information. If myo-inositol in high dose is an effective substance against depression there is the following danger: WHEN YOU START TAKING EFFECTIVE SUBSTANCES AGAINST DEPRESSION YOU GET FIRST MORE ENERGY BEFORE YOUR MOOD IMPROVES: IN THESE FIRST WEEKS OF ANTI-DEPRESSION TREATMENT YOU ARE IN DANGER OF SUIZIDE. PLEASE TALK WITH YOUR DOCTOR OR WITH A PERSON YOU TRUST:
To make the point I want to tell you a sad story I witnessed myself: At work we got a new trainee. He was a nice, bright fellow. He was the best of his class. I was one of his training on the job teachers. And one day I was told this young man has commited suizide. I was stunned, and I asked myself: did I do something wrong? Did I treat this person in a way that promoted his suizide? Later I learned part of his sad story: His girl friend had left him, probably because she could not stand his depression any longer. He moved to a new town, far away from family and friends and started a new job, the job I came in contact with him. He had a record of suizide attempts, that he maybe did not tell the new doctor he contacted for anti-depression treatment. He got an anti-depression medicine which was effective for him, and within three weeks he was dead. This young man would hopefully still live today if he had gone to a clinic for the beginning phase of anti-depression treatment, a clinic where doctors and nurses know well how dangerous the first time of treatment is.
EVERY ANTI-DEPRESSION MEDICINE TELLS YOU THAT THE FIRST WEEKS ARE DANGEROUS. PLEASE DO NOT USE YOUR FRESHLY GAINED ENERGY TO COMMIT SUIZIDE!

Anti-depression diet

The diet improves the intake of tryptophan, polyunsaturated fatty acids and inosistol. The daily intake is:

What	Why	When
orange or grapefruit juice	Provides myo-Inosistol	whenever you like
1 tablespoon cold pressed flaxseed oil	Provides polyunsaturated fatty acids	at breakfast
50 grams instant yeast	Provides Tryptophan, myo-Inosistol	at breakfast
100 grams cheese	Provides Tryptophan	at breakfast
almonds, cashew nuts	Provides Tryptophan, myo-Inosistol	as snack
1 tablespoon cold pressed flaxseed oil	Provides polyunsaturated fatty acids	at dinner
50 grams instant yeast	Provides Tryptophan, myo-Inosistol	at dinner

Recipe for myo-Inosistol drink:
Buy a baby food warmer and a large (250ml) baby bottle. The normal temperature range of the food warmer is 25°C to 60°C. Put 50 grams instant yeast and 100ml water in the bottle, close the bottle, shake the bottle and heat it at 50°C for 20 minutes. The yeast produces a little alcohol (say 0.2%), this is important for people who were alcohol addicted. Yeast produces also carbon dioxide. This will give the drink a sour taste.

Instant baker's yeast is available from LeSaffre, Fleischmann's, Red Star and others for reasonable prices (5.89 US-$ for 454 grams). You find it in the super market or via online merchants like amazon.com.

The table below shows the essential nutrients, the Recommended Daily Allowances (EU-RDA) and the values for the food. The EU-RDA is defined in Commission Directive 2008/100/EC. The nutrients values are taken from the USDA nutrient database, release 23. For some essential nutrients like chloride, biotin and others are no values given in the USDA database. The RDA values for amino acids are taken from WHO report 935 and are calculated for a person with 80 kg weight.

Essential nutrient	EU-RDA	yeast 100 g	flaxseed oil 13,6 g	almonds 100 g	cashew nuts 100 g	edam cheese 100 g	orange juice 200 g
Energy		325 kcal	120 kcal	575 kcal	553 kcal	357 kcal	90 kcal
Ca, Calcium	800 mg	30 mg	0	264 mg	37 mg	731 mg	22 mg
Fe, Iron	14 mg	2,17 mg	0	3,72 mg	6,68 mg	0,44 mg	0,40 mg
Mg, Magnesium	375 mg	54 mg	0	268 mg	292 mg	30 mg	22 mg
P, Phosphorus	700 mg	637 mg	0	484 mg	593 mg	536 mg	34 mg
K, Potassium	2000 mg	955 mg	0	705 mg	660 mg	188 mg	400 mg
Zn, Zinc	10 mg	7,94 mg	0	3,08 mg	5,78 mg	3,75 mg	0
Cu, Copper	1 mg	0,436 mg	0	0,996 mg	2,195 mg	0,036 mg	0,088 mg
Mn, Manganese	2 mg	0,312 mg	0	2,285 mg	1,655 mg	0,011 mg	0,028 mg
Se, Selenium	55 µg	7,9 µg	0	2,5 µg	19,9 µg	14,5 µg	0,2 µg
Cl, Chloride	800 mg
CaF₂, Fluoride	3,5 mg
Cr, Chromium	40 µg
Mo, Molybdenum	50 µg
I, Iodine	150 µg
Vit C, Ascorbic acid	80 mg	0,3 mg	0	0	0,5 mg	0	100 mg
Vit B1, Thiamin	1,1 mg	10,99 mg	0	0,211 mg	0,423 mg	0,037 mg	0,180 mg
Vit B2, Riboflavin	1,4 mg	4 mg	0	1,014 mg	0,058 mg	0,389 mg	0,060 mg
Vit B3, Niacin	16 mg	40,2 mg	0	3,385 mg	1,062 mg	0,082 mg	0,800 mg
Vit B5, Pantothenic acid	6 mg	13,5 mg	0	0,469 mg	0,864 mg	0,281 mg	0,380 mg
Vit B6, Pyridoxine	1,4 mg	1,5 mg	0	0,143 mg	0,417 mg	0,076 mg	0,080 mg
Vit B7, Biotin	50 µg
Folate (Vit B9 Folic acid)	200 µg	2340 µg	0	50 µg	25 µg	16 µg	60 µg
Vit B12, Cyanocobalamin	2,5 µg	0,07 µg	0	0	0	1,54 µg	0
Vit A, Retinol	800 µg	0	0	0	0	242 µg	20 µg
Vit E, alpha-Tocopherol	12mg	0	2,38 mg	26,22 mg	0,9 mg	0,24 mg	0,08 mg
Vit D, Cholecalciferol	5 µg	0	0	0	0	20 IU	0
Vit K, Phylloquinone	75 µg	0,4 µg	0	0	34,1 µg	2,3 µg	0,2 µg
Linoleic acid (18:2)		0,017 g	1,727 g	12,061g	7,782 g	0,418 g	0,058 g
α-Linolenic acid (18:3)		0	7,249 g	0,006 g	0,062 g	0,247 g	0,022 g
Tryptophan	0,32 g	0,54 g	0	0,214 g	0,287 g	0,352 g	0,004 g
Threonine	1,2 g	1,99 g	0	0,598 g	0,688 g	0,932 g	0,016 g
Isoleucine	1,6 g	1,89 g	0	0.702 g	0,789 g	1,308 g	0,016 g
Leucine	3,12 g	2,92 g	0	1,488 g	1,472 g	2,570 g	0,026 g
Lysine	2,4 g	3,28 g	0	0,580 g	0,928 g	2,660 g	0,018 g
Methionine	0,83 g	0,59 g	0	0.151 g	0,362 g	0,721 g	0,006 g
Cystine	0,32 g	0,5 g	0	0,189 g	0,393 g	0,255 g	0,005 g
Phenylalanine	2 g	1,75 g	0	1,120 g	0,951 g	1,434 g	0,018 g
Valine	2,08 g	2,31 g	0	0,817 g	1,094 g	1,810 g	0,022 g
Histidine	0,8 g	0,91 g	0	0,557 g	0,456 g	1,034 g	0,003 g

Hunter-gatherer diet

The anti-depression diet above, which exchanges two of three daily meals, is part of a full hunter-gatherer diet. The diet of a hunter-gatherer has prey (game), eggs, insects, vegetables, root vegetables, fruits, nuts and seeds. The hunter-gatherer diet has no gluten (no bread), no lactose (no milk), no sugar, no caffeine, no nicotine and only a little alcohol (even animals know and like fermented fruits where part of the fruit sugar was converted to alcohol). Living a hunter-gatherer diet today is no problem. An important part of the hunter-gatherer diet is the food preparation. Hunters eat meat and fish raw or nearly raw. That is, in the restaurant, you have to order your steak raw. Or as in japanese cuisine, you eat sashimi, raw fish. The instant yeast as food in the anti-depression diet above replaces the insects as food. Insects were eaten raw and did not only deliver protein like lean meat, but a lot of essential nutrients. Real insects as food, like roasted grasshoppers, are still in favour in some parts of the world, for example Thailand.
A modern gatherer breakfast can be created out of buckwheat, sesame seeds, orange juice, nuts and fruits. A modern hunter lunch is liver cheese with mixed salad or sashimi with daikon and carrots. As snack the modern gatherer eats nuts and seeds like cashew nuts and pumpkin seeds. For more recipes look for example at gluten-free girl and the chef.
The hunter-gatherer diet can be extended with rice, corn, potatos and cheese. Rice, corn and potatos are gluten free. Hard, aged cheese has little lactose. Most adults with lactose intolerance can eat hard cheese without problems. Well known hard cheese varieties are emmental, cheddar and gruyère. Gouda cheese is offered with different mature times. Young gouda is mild, but still has lactose, old gouda is salty and has very little lactose. Extra hard cheeses have a mature time of 15 months and more, like the parmesan and the sbrinz.
Attention: The hunter-gatherer diet contains eggs, fish, crustacean shellfish (including shrimp, prawns, lobster and crab) and tree nuts (including cashews, almonds, walnuts, pecans, pistachios, Brazil nuts, hazelnuts and chestnuts). These food are major allergens as reported by the U.S. Centers for Disease Control. Be careful if you start a new food. If you are unlucky, you react allergic to the new food.

food	food preparation
meat	brew sausages like liver cheese (heated up to 68°C), bacon (salt-cured meat), steak roasted "raw"
fish	sashimi (tuna, salmon, squid), soused herring (kippered herring)
eggs	soft-boiled egg (heated up to 70°C for protein coagulation)
insects	instant yeast drink as replacement
vegetables	peppers, kiwifruit, salad, tomatos, peas, .. are eaten raw.
root vegetables	carrots, sweet potatos, garlic, onions, .. are eaten raw
fruits	fruits are eaten raw
nuts	nuts are eaten raw
seeds	seeds are eaten raw after crushing or grinding (e.g. sesame flour, buckwheat flour, )

Essential nutrient	EU-RDA	Liver cheese 100 g	kippered Herring 100 g	boiled Egg 100 g	Sesame flour low-fat 100 g	Buckwheat flour 100 g
Energy		304 kcal	217 kcal	155 kcal	333 kcal	335 kcal
Ca, Calcium	800 mg	8 mg	84 mg	50 mg	149 mg	41 mg
Fe, Iron	14 mg	10,83 mg	1,51 mg	1,19 mg	14,22 mg	4,06 mg
Mg, Magnesium	375 mg	12 mg	46 mg	10 mg	338 mg	251 mg
P, Phosphorus	700 mg	207 mg	325 mg	172 mg	757 mg	337 mg
K, Potassium	2000 mg	226 mg	447 mg	126 mg	397 mg	577 mg
Zn, Zinc	10 mg	3,7 mg	1,36 mg	1,05 mg	10 mg	3,12 mg
Cu, Copper	1 mg	0,383 mg	0,135 mg	0,013 mg	1,425 mg	0,515 mg
Mn, Manganese	2 mg	0,200 mg	0,050 mg	0,026 mg	1,396 mg	2,030 mg
Se, Selenium	55 µg	36,5 µg	52,6 µg	30,8 µg	0	5,7 µg
Cl, Chloride	800 mg
CaF₂, Fluoride	3,5 mg
Cr, Chromium	40 µg
Mo, Molybdenum	50 µg
I, Iodine	150 µg
Vit C, Ascorbic acid	80 mg	3,0 mg	1,0 mg	0	0	0
Vit B1, Thiamin	1,1 mg	0,212 mg	0,126 mg	0,066 mg	2,516 mg	0,417 mg
Vit B2, Riboflavin	1,4 mg	2,227 mg	0,319 mg	0,513 mg	0,269 mg	0,190 mg
Vit B3, Niacin	16 mg	11,768 mg	4,402 mg	0,064 mg	12,533 mg	6,150 mg
Vit B5, Pantothenic acid	6 mg	3,536 mg	0,880 mg	1,398 mg	2,745 mg	0,440 mg
Vit B6, Pyridoxine	1,4 mg	0,470 mg	0,413 mg	0,121 mg	0,142 mg	0,582 mg
Vit B7, Biotin	50 µg
Folate (Vit B9 Folic acid)	200 µg	104 µg	14 µg	44 µg	29 µg	54 µg
Vit B12, Cyanocobalamin	2,5 µg	24,55 µg	18,70 µg	1,11 µg	0	0
Vit A, Retinol	800 µg	5252 µg	40 µg	148 µg	0	0
Vit E, alpha-Tocopherol	12mg	0	1,54 mg	1,03 mg	0	0,32 mg
Vit D, Cholecalciferol	5 µg	0	86 IU	87 IU	0	0
Vit K, Phylloquinone	75 µg	0	0,1 µg	0,3 µg	0	7 µg
Linoleic acid (18:2)		3,090 g	0,178 g	1,616 g	0,618 g	0,877 g
α-Linolenic acid (18:3)		0,330 g	0,141 g	0,048 g	0,011 g	0,071 g
Tryptophan	0,32 g	0,206 g	0,275 g	0,208 g	1,097 g	0,183 g
Threonine	1,2 g	0,651 g	1,078 g	0,821 g	2,081 g	0,482 g
Isoleucine	1,6 g	0,631 g	1,133 g	0,933 g	2,157 g	0,474 g
Leucine	3,12 g	1,331 g	1,998 g	0,861 g	3,841 g	0,792 g
Lysine	2,4 g	1,178 g	2,258 g	1,229 g	1,608 g	0,640 g
Methionine	0,83 g	0,342 g	0,728 g	0,533 g	1,656 g	0,164 g
Cystine	0,32 g	0,328 g	0,264 g	0,397 g	1,012 g	0,218 g
Phenylalanine	2 g	0,328 g	0,960 g	0.908 g	2,658 g	0,495 g
Valine	2,08 g	0,806 g	1,266 g	1,043 g	2,800 g	0,646 g
Histidine	0,8 g	0,393 g	0,724 g	0,405 g	1,476 g	0,294 g

Tryptophan

L-Tryptophan is an essential amino acid. The body can not produce essential substances. In the brain tryptophan is changed into serotonin, the neurotransmitter which is manipulated by Prozac and other SSRI drugs. The recommended daily intake is 3.5mg to 6mg per kilogram body weight. A 80 kg male needs 400mg tryptophan per day. Meat and cheese are easy sources of tryptophan.

food	Tryptophan in 100 grams
Seeds, sesame flour, low-fat	1097 mg
Seeds, sunflower seed flour, partially defatted	735 mg
Seeds, pumpkin and squash seed kernels, dried	576 mg
Cheese, parmesan, shredded	560 mg
Pork, ground, 96% lean / 4% fat, cooked, pan-broiled	409 mg
Beef, round, top round, separable lean only, trimmed to 0" fat, choice, cooked, braised	405 mg
Cheese, edam, gouda or tilsit	352 mg

Eicosapentaenoic acid (EPA)

The essential fatty acids play a role in inflammation. Eicosapentaenoic acid (EPA, 20:5 n-3) reduces inflammatory actions of the body. EPA is found in fish. The body can produce EPA out of alpha-linolenic acid (ALA) which is found in seeds.
The normal Omega-3 (ω-3) fatty acids pills are produced by using fish intestines. The fish innards ω-3 fatty acid can be polluted with mercury, arsenic, cadmium or other heavy metals. The UK Food Standards agency (FAS) wrote in 2006: "High levels of mercury were found in samples of tuna and swordfish .. The highest levels of arsenic (30.84 mg/kg) and cadmium (3.7 mg/kg) were both found in individual samples of crab".
A new method is to use algae to produce ω-3 fatty acids, but there are not many suppliers of algae ω-3 products on the market. The third source for ω-3 fatty acids is oil pressed out of seeds. The risk of contamination is low in seed oil.

oil	eicosapentaenoic acid (EPA)
Fish oil, salmon	13.023 %
Fish oil, sardine	10.137 %
Fish oil, herring	6.273 %

oil	Linnaean name	α-Linolenic acid (ALA)
Chia	Salvia hispanica	64 %
Perilla	Perilla frutescens	58 %
Flaxseed	Linum usatissimum	55 %

Table 1 tells the EPA and ALA values of different oils. ALA or 18:3(n-3) is like EPA or 20:5(n-3) an ω-3 fatty acid. Cold pressed flaxseed oil is easy to get. An important point in the anti-depression diet is food preparation. All essential nutrients for the brain are destroyed by heat (cooking). The oil mill should only cold press the oil (flaxseed) or use steam distillation (perilla). Every other production method will destroy too much of the wanted contents of the seeds.

myo-Inositol

Some years ago, inositol was called vitamin B8. Today we know that the body can produce inositol itself. Since 1995 there are clinical reports about successful myo-inositol treatment for depression, bipolar depression, obsessive-compulsive disorder and panic disorder.
The first source for inositol production was yeast. The organism saccharomyces cerevisiae, a fungus, is with human civilization for thousands of years. The most prominent use of budding yeast is baking and brewing.
The standard commerial source for inositol is corn steep liquor, a by-product of corn wet-milling. The production cost of inositol out of yeast or out of corn steep liquor is minimal. If you like pills instead of food, buy myo-inositol as chemical powder direct in China. For example from Zhucheng Haotian Pharm Co., Ltd in Xinxing Town, Weifang, Shandong. The smallest container size is 25 kg. Compare the price direct of the factory with the price from your scarab and you can imagine the profit margins in the dietary supplement business.

With common food a myo-inosistol diet with 12 grams intake per day for anti-depression treatment is not possible. With a lot of orange juice drinking and nuts eating the myo-inosistol intake can be driven up to 1.5 grams a day. The remaining myo-inosistol intake is by yeast. For an inosistol diet instant yeast is used. This product was first marketed by LeSaffre in the 1970s. Because yeast myo-inosistol was not processed much, the absorption is hopefully better then with crystaline myo-inosistol. A daily intake of 100 grams to 200 grams of instant yeast is possible with a 2000 kcal diet. With the other myo-inosistol carrier like orange juice, bran, almonds and walnuts a myo-inositot intake of 3 grams daily only through diet are possible. Yeast is a good source for essential nutrients. Again, because these substances were created by an organism the absorption is good.

Food with high myo-inositol content is only as good as the food preparation you do. The goal in inositol production is to get as much cyristaline inositol out of the raw product as possible. In food preparation we have the same goal. The basic handling of yeast to open up the inositol is described in a 1966 paper by : "autolyzing yeast for 5 hr at 38°C in the presence of toluene ... To 100 g fresh [yeast] weight of it (29 g dry weight), in a liter flask, 10 ml of toluene was added".

substance	weight needed for equal growth
beef tissue	1 gram
wheat germ	0.25 gram
yeast	0.2 gram

Table 2 from V. Reader; growth of S. corallinus; 1928

Table 2 tells us that yeast is the best growth factor.

substance	myo-inositol in mg/g
wheat, stone ground	11.5
yeast, dry	11
prune, dried	4.7
beans, great northern, canned	4.4
grapefruit juice, frozen, concentrate (reconstituted 3 part water with 1 part concentrate)	3.8
liver cheese	3.46
orange, fresh	3.07
creamy peanut butter	3.04
almonds	2.78
bran, 40% flakes, dry	2.74
Peas, large English, canned	2.35
orange juice, canned	2.00
walnuts	1.98

Table 3 from Clements, Darnell; myo-inositol content of common food; 1980. The myo-inositol value for yeast was taken from Trevelyan; Preperation of phosphatidyl inositol from bakers's yeast; 1966.

Table 3 tells us some top myo-inositol sources. Some substances will loose their good myo-inositol content because of food preparation, or do you eat your wheat without baking first? Eating beans without cooking first is not advised. But peas can be eaten raw. Easy candidates are grapefruit juice, orange juice and bran with flakes. Dried prunes, almonds and walnuts are great for snacks. In sausage production, liver cheese is heated only up to 68°C. This is the secret behind the good myo-inositol content. In Germany there are other sausages that are produced the same way, the common name is "Brühwurst" (brew sausage).

Instant yeast content

The instant (dried) yeast has typically the following content:

Composition : Saccharomyces cerevisiae > 98.5 %
Emulsifier : sorbitan monostearate (E491) < 1.5 %
Gold Label: Ascorbic acid : 2500-3500 mg/kg
Contains no other chemical additive.

- Physico-chemical characteristics :
- Dry matter (D.M.) : 94.5 – 96.5 %
- Proteins (nitrogen x 6,25)/D.M. : 40 – 52 %
- P₂O₅/D.M. : 2 – 3 %
- Total glucids / D.M. : 35 – 45 %
- Total lipids / D.M. : 5 – 8 %
- Mineral matters / D.M. : 4 – 7 %
- Energy (in Kcal) : » 300 to 400 for 100 g of yeast

Iron 2-4 mg
Calcium 15-30 mg
Sodium 50-100 mg
Potassium 1500-1900 mg
Phosphorous 2300-2500 mg
Thiamin 9-16 mg
Niacin 40-60 mg
Riboflavin 4-6 mg
Vitamin C 250-350 mg

The myo-inosistol content is part of the "Total lipids" number. In the organism myo-inosistol is in the form of phosphatidylinositol, a phospholipid. A phospholipid can be used as emulsifier, enabling oils to dissolve in water. The myo-inosistol content of instant yeast is at least 1.1% or 11mg/g. These numbers are from a 1966 report by W. Trevelyan. With 100 grams instant yeast the myo-inosistol amount is 1.1 grams.

Ketamine, Toluene, Nitrus Oxide

Ketamine is an anesthetic drug. Because it is on the "List of World Health Organization Essential Medicines" the drug is easy to get. Ketamine is used as party drug. With a specific dose, hallucinations and out-of-body experiences happen. Since 2008 ketamine is researched as a drug against depression. The hope it that ketamine opens a door for fast-acting anti-depression drugs. Clinical reports show that ketamine has an effect within 40 minutes. Usual anti-depression drugs need weeks of intake before they help.

Toluene is a common solvent. Toluene works like an inhalation anesthetic, but is not used as such. Toluene is used in the printing industry. A 1999 german report says: "Exposure to toluene in the printing industry is associated with subfecundity in women but not men". Toluene is used by benzene-sniffers to get high, but research with toluene as anti-depression substance is still at the level of mice tests (the professor should just ask the printing industry worker how this drug works on humans). In mice tests toluene is an anti-depressive substance, too.

Nitrous Oxide, Dinitrogen monoxide, E942 or "laughing gas" is an anesthetic drug. The whipped cream canisters use laughing gas as aerosol propellant. The laughing gas is in the cream. If you eat the cream, you consume laughing gas. The name "laughing gas" comes from the short time (30 seconds to 4 minutes) euphoric effects of inhaling the gas. Nitrous oxide functions as a neurotransmitter by diffusing into surrounding cells. Laughing gas induces dopamine release and activates dopaminergic neurons. Laughing gas is used as antipanic (anxiolytic) drug. The use of laughing gas against depression is not researched much, but at least one authority has noted a therapeutic antidepressant action. As with all drugs the dose makes the poison. Very large intake of laughing gas in the lungs can cut down your oxygen supply. In medical use as anesthetic, laughing gas is given with pure oxygen.

Inflammation, Ailments and Depression

"Inflammation is therefore an important biological event that might increase the risk of major depressive episodes" was written in the article "From inflammation to sickness and depression: when the immune system subjugates the brain". Depression is possible without inflammation, but inflammation makes depression worse. A diet against your inflammation is a diet against your depression.
The rhizomes of the Turmeric (Curcuma longa) or "indian saffron" are known to help against inflammation. Dried, powdered turmeric rhizomes is a yellow powder. As food additive it is called E100. The taste is bitter. Curcuma is used for "yellow rice". Curry, this mixture of spices, contains curcuma.
Some ailments are connected with food. Well known is Coeliac disease. Many adults with subtle disease have only fatigue as symptom. Coeliac disease is caused by a reaction to gliadin, a gluten protein, found in wheat. Corn (maize), rice, buckwheat and millet do not have gliadin.
Lactose intolerance is another common ailment for adults. In Asia and Afrika 90% of the adults have lactose intolerance. Like coeliac disease, lactose intolerance is often without symptoms.
Fructose malabsorption is found in up to 40% of the population of Western countries. Some effects of fructose malabsorption are decreased tryptophan, folic acid and zinc in the blood. Tryptophan is the essential nutrient for serotonin, an important "brain chemical" to avoid depression.
Note: This paragraph is based on the Wikipedia articles about Coeliac disease, Lactose intolerance and Fructose malabsorption.

Depression and Psoriasis

Psoriasis is an ailment that is connected to genetics, nutrition and stress. In USA, 4% to 5% of the people have this ailment, in Japan and China only 0.025% to 0.3%. If we compare the typical food in USA and Asia, we will find that wheat is typical for western nutrition and rice is typical for eastern nutrition. As seen above, wheat is connected with coeliac disease. Psoriasis can be called an inflammation. If a person has depression and psoriasis, every substance that helps against psoriasis should help against depression, too. Fighting against inflammation uses up the same substances in the body that are important to stay away from depression.
The vitamins D and B₁₂ are important to improve psoriasis.

Depression, a disease of civilization?

Coeliac disease, lactose intolerance and fructose malabsorption are common ailments today. If we eat wheat, eat fruit sugar or drink milk we consume a "normal" diet. Maybe your adult body can handle this diet, maybe not. A hunter-gatherer diet of meat, vegetables, nuts and seeds does not trigger the three common ailments.
There is a genetic part in depression, and there is a stress related part in depression, too. A third part for depression is the diet. You can not change your genetic heritage, and you can do not much about stress, but you can do a lot about what you eat. Caffeine, alcohol and even sugar are considered bad for the serotonin level. Food that does not trigger ailments in your body and does not need heating above 68°C in food preparation is considered good for the serotonin level.

Here is my thinking about why depression treatment with diet or drugs works at all: The chemicals in the brain are in a balance that is determined by your intake (food and drugs) and your health (your genetics, your environment). This balance is not totally fixed. It allows you positive and negative emotions around your "normal mood". From a control theory point of view the variations from your normal mood, your "normal operation point" can have two reasons:

There is a negative and positive threshold below and above the "normal operation point". The moods like sadness and happiness can go up to these thresholds, but not beyond.
The reaction time of the control loop is slow. Positive and negative moods can exist for the time the control loop needs to counteract the mood. The regulation of the "operation point" is inert.

Both control loop behaviours can be seen in "normal" people. A normal person can become sad, but not more sad then sad. If sadness is a reason for suicide in people with depression, normal people do not experience such a deep sadness. The threshold kicks in. The proverb "time cures all wounds" shows the control loop behaviour over time. The loss of a dear person produces a deep wound, but over time "normal" people recover and show after some time again the full bandwidth of human emotions.
If we believe that it is valid to apply control theory to the area of depression, we can ask what we can learn from control theory about depression. What can go wrong in a control loop and what can control theory tell us about fixing it?

Reason	Symptom	Fix
Not enough "drive" to reach the intended "operation point".	The average behaviour is biased. In average there is more negative mood then positive mood.	The control loop sends out the correct signals. But the "drive" has not enough "power" to realize the command from the control loop. If serotonin is needed for the "mood control loop" and there is not enough serotonin, the control loop can not realize the intended "operation point".
Wrong "normal operation point".	The average behaviour is biased.	Change the control loop. This may not be possible for depression if the "normal operation point" is determined by genetics. The only possibility is to flood the system with the substance that drives the working point in the proper direction. This flooding helps if the control loop can not "regulate" away all of the surplus substance.
Connection between control loop and drive is broken.	Stimulation does not change behaviour.	Whatever signals the control loop creates, the "drive" is disconnected. The drive, working on it's own, can produce to much or to little. Only over-flooding the system with the substance that brings the system closer to the intended working point helps.

The symptoms for the different reasons are very similar. Therefore is it not possible to deduce from the symptom to the reason. The fix in all cases is to bring more of the substance into the system that drives the working point into the proper direction. The amount of this substance is different for the different reasons. In the first case, the control loop itself is fine, but there is not enough "fuel" in the system. The system needs a "fair" amount of the substance to reach the correct working point. In the other cases, the control loop is broken. The control loop must be over-ruled by over-flooding the system with the lacking substance. Porting this knowledge from control theory to depression treatment, we can say: There should be patients that need only a little additional amount of serotonin to feel better. These patients have a correct control loop, but not enough serotonin. The other patients need a massive dose that is much above the normal intake. In these patients, the control loop is broken. From the intake of serotonin only a small amount reaches the "interesting places", the receptors. The small amount that "comes through" is because of the imperfection of the control loop. Even if the control loop gives another command, a little of the not wanted substance (not wanted by the control loop) seeps through.
If you are a patient with not enough "drive" to reach the "operation point", an anti-depression diet will help you, hopefully. If you have one of the other reasons, the diet will not provide enough "substance" to over-flood your system. In this case, you have to take drugs. At the moment, nobody can conclude from the symptoms to the reasons. Therefore we do not know how many depression patients can be helped with diet and how many patients need more then diet. We know for sure only one thing: No pharma company wants to spend money in investigation the "diet for depression" treatment. There is no money in this undertaking. The money is in patents for drugs. Public health organizations could investigate the "diet for depression" topic. But these organizations are up to the neck in bureaucracy. And bureaucracy does not like change. The current treatment for depression is you get a drug, not you get a diet.

Essential nutrient

The body can not produce essential nutrients. In the USDA Nutrient Database these substances are listed with codes. The codes are given in the following table. No enriched or fortified foods were used as food examples.

Nutrient	USDA	Food example
Ca, Calcium	Calcium	Cheese
Fe, Iron	Iron	Rice bran, crude
Mg, Magnesium	Magnesium	Rice bran, crude Nuts, brazilnuts, dried, unblanched
P, Phosphorus	Phosphorus	Pumpkin and squash seed kernels, dried
K, Potassium	Potassium	Beans, white, mature seeds, raw
Cu, Copper	Copper	Cashew nuts, raw
Mn, Manganese	Manganese	Rice bran, crude
Se, Selenium	Selenium	Mixed nuts, without peanuts, oil roasted, with salt added
Zinc	Zinc	Beef
Cl, Chloride	not in USDA
Cr, Chromium	not in USDA
CaF₂, Fluoride	not in USDA
I, Iodine	not in USDA
Mo, Molybdenum	not in USDA
Vit C, Ascorbic acid	VITC	Peppers, Broccoli, Kiwifruit, Brussels sprouts
Vit B1, Thiamin	THIA	Yeast, baker's, active dry
Vit B2, Riboflavin	RIBF	Yeast, baker's, active dry
Vit B3, Niacin	NIA	Yeast, baker's, active dry
Vit B5, Pantothenic acid	PANTAC	Yeast, baker's, active dry
Vit B6, Pyridoxine	VITB6A	Nuts, pistachio nuts, raw Yeast, baker's, active dry
Vit B7, Biotin	not in USDA
Folate (Vit B9 Folic acid)	Folate	Yeast, baker's, active dry
Vit B12, Cyanocobalamin	VITB12	Liver cheese, pork
Vit A, Retinol	Retinol	Liver sausage, liverwurst, pork
Vit E, alpha-Tocopherol	TOCPHA	Oil, sunflower
Vit D, Cholecalciferol	VITD	Fish, mackerel, salted
Vit K, Phylloquinone	VITK1	Fast foods, potato, french fried in vegetable oil
Linoleic acid (18:2)	F18D2	Oil, sunflower, linoleic, (approx. 65%)
α-Linolenic acid (18:3)	F18D3	Oil, flaxseed
Tryptophan	Tryptophan	Seeds, sesame flour, low-fat Yeast, baker's, active dry
Threonine	Threonine	Seeds, sesame flour, low-fat
Isoleucine	Isoleucine	Cheese, parmesan, shredded Yeast, baker's, active dry
Leucine	Leucine	Cheese, parmesan, shredded Seeds, sesame flour, low-fat
Lysine	Lysine	Cheese, parmesan, shredded Seeds, sesame flour, low-fat
Methionine	Methionine	Seeds, sesame flour, low-fat
Cystine	Cystine	Seeds, sesame flour, low-fat
Phenylalanine	Phenylalanine	Seeds, sesame flour, low-fat
Valine	Valine	Cheese, parmesan, shredded
Histidine	Histidine	Cheese, parmesan, shredded Seeds, sesame flour, low-fat

Literature

Wildiers, E. 1901. A new substance indispensable to the development of yeast. La Cellule. 18: 313-332

V. Reader; The effect of the addition of growth-promoting substances to the synthetic medium on the growth of streptothrix corallinus; 1928; Department of Phsiology and Biocheistry, University Collage, London

W. Trevelyan; Preparation of phosphatidyl inositol from bakers's yeast; 1966; Journal of Lipid Research, vol 7, 1966, pp. 445-447

J. Rattray, A. Schibeci, D. Kidby; Lipids of Yeasts; Bacteriological Review, Sept. 1975. p. 197-231

R. Clements, B. Barnell; Myo-inositol content of common foods: development of a high-myo-inositol diet; The american Journal of Clinical Nutrition 33; September 1980; pp. 1954-1967

Pramod Agrawal, Cerechem Corporation; Microbial method of producing inositol; US patent 5296364; filed 21.Jul.1992

Levine J, Barak Y, Gonzalves M, Szor H, Elizur A, Kofman O, Belmaker RH; Double-blind, controlled trial of inositol treatment of depression; Am J Psychiatry. 1995 May;152(5):792-4.

A. Plenge-Bönig, W. Karmaus; Exposure to toluene in the printing industry is associated with subfecundity in women but not men; Occup Environ Med 1999;56:443–448

I. Wilhelmsen; Brain-gut axis as an example of the bio-psycho-social model; Gut 2000;47:iv5-iv7

J. Kirschmann; Nutrition almanac, 6th edition; 2007; Nutrition Search Inc., McGraw-Hill; pp. 48-49

S. Cruz, P. Soberanes-Chávez, N. Páez-Martinez, C López-Rubalcava; Toluene has antidepressant-like actions in two animal models used for the screening of antidepressant drugs; 2008; Psychopharmacology Volume 204, Number 2, 279-286

R. Dantzer, J. O'Connor, G. Freund, R. Johnson, K. Kelley; From inflammation to sickness and depression: when the immune system subjugates the brain; Nature Reviews Neuroscience 9, 46-56 (January 2008)

World Health Organisation; Protein and amino acid requirements in human nutrition, WHO technical report series no. 935; 2007

European Commision; Commission Directive 2008/100/EC .. recommended daily allowances; 2008

U.S. Department of Agriculture, Agricultural Research Service; USDA National Nutrient Database for Standard Reference, Release 23; 2010

About the author

The author has no education in neuro science, psychology, medicine, biology or chemistry. But the author has studied computer science. Computer programs are complex machines. If the "software homunculus" is a primitive copy of the programmer, it is fruitful to transfer back knowledge. If the servant is like the master, a close look at the servant may explain the working of the master. The servant is a primitive copy of the master. The master can only build a homunculus in his own image, because this is the only image the master knows. Control theory is an area where master and servant obey the same rules.