We talked about calorie restriction and it's relation to life span. Apparently there are monkeys and mice on restricted calorie diets that live 2-4x longer than regular monkeys. Low cal/high nutrient diet drastically slow down the aging process, but the reasons are unknown. I suggested to my teacher it was because hormones like testosterone and IGF are lower in a caloric deficit, and she didn't even know that happened. You guys heard anything about it? Any opinions, reasons why it exists? I found it a pretty interesting lecture whereas I usually fall asleep in class.