1. Don’t overeat
If you want to live to 100, leaving a little bit of food on your plate may be a good idea. Author Dan Buettner, who studies longevity around the world, found that the oldest Japanese people stop eating when they are feeling only about 80% full.
St. Louis University researchers have confirmed that eating less helps you age slower; in a 2008 study they found that limiting calories lowered production of T3, a thyroid hormone that slows metabolism—and speeds up the aging process.