I am tremendously helped with my chronic depression by a diet that cuts way down on Branched-Chain Amino Acids (BCAA's). That is because BCAA'S lower the serotonin and the dopamine in the brain. And you need serotonin and dopamine to feel good. Do your own research. Google "Branched-Chain Amino Acids and Depression."
To experiment with this, try this diet for a few days to a week and see if it works for you:
Vegan + no or very limited nuts, beans, & seeds. Simple.
Explained in more detail:
Vegan means no beef, chicken, lamb, pork, ham, cold cuts, turkey, eggs, dairy (no yogurt, cheese, milk, etc.) IN OTHER WORDS NO ANIMAL PRODUCTS OF ANY KIND EXCEPT HONEY AND GHEE ARE OKAY.
AS WELL, cut way down on these plant proteins: legumes, beans, lentils, peas, all nuts, all seeds. I remember the diet this way:
Vegan plus nuts, beans, seeds. So simple.
It's a limited diet, yes. But you may see good results, as I do. You will have more serotonin and dopamine, which will free your mind. It works for me.
Plus I uploaded my DNA results from 23andMe to Nutrahacker, and now I know what supplements/foods are good for me and which to avoid. For example I'm positive for the MTHFR mutation, so I take folate. Usually one with the MTHFR mutation takes methylfolate, but Nutrahacker tells me I don't tolerate methyl groups well, so It take folinic acid instead. Nutrahacker told me lots else, too. For example I have the CBS mutation, which means I must follow a low-protein, low thiols sulfur diet. No time to go into it all here. It will cost you around $199.00 for 23andMe plus around $35.00 for Nutrahacker. You will never regret it.
For me, my Nutrahacker results plus the low BCAA diet and low sulfur diet is great. Take it from someone who has searched high and low to cure my dysthymia, and doesn't like pharmaceuticals.