A new report from Harvard researchers has found the top foods that are making us fat, and the findings are not at all surprising.

The extensive study used data for over 120,000 healthy men and women from previous studies to track their diet every four years from 1986 to 2006 to see how their lifestyle and what they ate affected their weight. The researchers found that within each period the average weight gain was a little over three pounds — which added up to a 17-pound total weight gain over the 20-year period.
What caused that weight gain? Topping the list of culprits are meat, sweetened drinks, fried foods, and any form of potatoes. The biggest cause of weight gain was eating french fries; every extra serving of fries eaten in a day was linked to a gain of more than three pounds, while eating an extra serving of potato chips led to 1.69 pounds. Other diet busters included refined grains (like white rice and white bread) and butter.
But the news wasn't all bad; the study also identified the foods that helped prevent weight gain. Read on for the list of foods that cause and prevent weight gain.