I concur. I am finally starting to snap out of a multi-year long depression spell myself. Now, I did not alter my diet nor exercise more. I drink the same amount as I did prior.

However, blood work showed I was deficient in Vitamin-D. So, I added some herculean dosage of fish-oil and prescription Vitamin-D to my life. After about 3 months or so, I am really starting to feel much better and I am starting to notice more productivity gains. The weather is warming up in my area too. That always helps.