[scotty79]

The only reason why we are here and not rotting are our immune systems. Take it away and we dissolve in matter of days.

Recently research on very old lady showed that all of her immune cells came from just a handful of stem cells.

It made me think that the only reason we live that long is because, that's how long our immune system lives. As we grow old it becomes less and less versatile as stem cells die out and less effective as the most effective randomly die out. Then the old age diseases kick in as there's less and less competence in cleaning up this pile of bio-matter that we are.

Excising and eating a little is not because it almost kills us and therefore it makes us stronger, just because our cleaning crew was optimized for much less food and much more movement.

Stress is not good for you. When you see pair of identical twins you can tell which one lived life of more stress. He/she looks older and by various measurements is older.