Better living through chemistry....
starts with remembering that food is composed of chemicals. Mind you, I know absolutely nothing about the details of the chemistry (save perhaps that you could use something like 17-alpha methyltestosterone to get testosterone past the stomach, and it's cheap), but I do know that the body reacts to food, to activities, to stress, and that many of the changes we ascribe to age are as much a consequence of age related changes in diet, behavior and environment than the aging process itself.
