Great topic!!
I have had to make countless adjustments and additions to my daily diet and nutrition intake. Where to start, I do not know.
I have researched nutrition books and the Autism Coach Website to help me go through the hard knocks I have to endure on a daily basis. For my employment, to socialize meaningfully, and even to drive in town I often have to take some nutritional supplements.
My most important changes that I have made are getting rid of wheat gluten, cow dairy/casein proteins, processed foods, and sugar. I use omega 3 capsules, L-Tyrosine, glutamine, magnesium bisglycinate powder and creatine to name a few
things I use. I make an amino shake and take quite a few vitamins and herbal pills before going to work. No grains but hemp hearts, maca powder and roasted carob for my pre-work shift meals.
A lot of stuff but it works!
How about Tryptophan? It's a precursor of the happiness hormone, melatonin, and niacin.
'Although you can't supplement with serotonin itself, its precursor, the amino acid tryptophan, is readily available as a safe, well-proven supplement. Supplementation with tryptophan reduces irritability in older adults, in women with premenstrual syndrome, and in people with depression and anxiety.'
'Most of these health benefits come from the potential increase of niacin and thus serotonin. The benefits from more serotonin include: promoting healthier and better quality sleep. relief from depression and anxiety.'
All worst stuff many on the spectrum struggle with.
Found in some foods and natural supplements with spirulin or bee pollen, royal jelly.