This is not commentary on the writing of John Steinbeck but, rather, a notation that scientists recently proved the obvious: If you want to stay young for as long as possible, eating less and exercising more is the key.
In short, here's what they did to prove it. With genetic engineering they created mutant mice that mimicked the effects of eating less and exercising. Their report is in the journal Science and concludes that the reasons for the mice staying young has to with insulin, the hormone that regulates glucose.
For the full story on their findings, go here. .