1. Potatoes Cause Weight Gain
Harvard researchers have been all over the humble potato in a study that tracked a huge group of participants, 120,000 strong, over 12 years. The results concluded that people who ate an extra serving of potatoes prepared in any fashion gained an average of 1.3 extra pounds.
The numbers only get worse when you look at potato chips, which were associated with 1.7 extra pounds, and French fries, which were responsible for 3.4 extra pounds.