Potatoes bad, nuts good for staying slim, Harvard study finds

Yeah, there is something to that Paleo eating after-all.

Everyone knows that people who chow down on french fries, chug soda and go heavy on red meat tend to pile on more pounds than those who stick to salads, fruits and grains.

But is a serving of boiled potatoes really much worse than a helping of nuts? Is some white bread as bad as a candy bar? Could yogurt be a key to staying slim?

The answer to all those questions is yes, according to the provocative revelations produced by a big Harvard project that for the first time details how much weight individual foods make people put on or keep off.

The federally funded analysis of data collected over 20 years from more than 120,000 U.S. men and women in their 30s, 40s and 50s found striking differences in how various foods and drinks — as well as exercise, sleep patterns and other lifestyle choices — affect whether people gradually get fatter.