Originally Posted by Retiree

Longer fasting, meaning days, lowers testosterone during that fast...but when the fast ends, testosterone levels go way higher than they were before, for weeks. Army was doing testing on soldiers...they were starving them for 1-2 weeks, making them exercise for hours each day and their testosterone levels dropped by 50% or more...but then they switched their diet, they were getting more calories and protein, less exercise, and their testosterone levels spike to 2-4x what they were before. Then they were gaining crazy muscle for 2-4 weeks until it slowed down again.

I tested it and it works like a charm...2-3 weeks after I finished a 3 day fast, I hit my PRs in almost every exercise.