Potatoes are always a part of Southern cooking: French fries, fried potatoes and onions, baked potatoes and boiled potatoes with other veggies are yummy sides to any main course. Potatoes are inexpensive, usually fat-free and cholesterol-free source of vitamins and fiber. But a new study has shown that potatoes might contribute to weight gain -- and not just when they are fried.

Researchers at the Harvard School of Public Health found that ordinary potatoes, even eaten in moderation, might be fattening.

"The starch in potatoes is the problem," said lead researcher Dariush Mozaffarian. "Overall, physiologically, potatoes, refined grains and sugars are all likely equally detrimental for weight gain."

"In other words, calorie for calorie, there is little difference between eating a potato, cornflakes, white bread or a bowl of table sugar."