A study has found that among the rich calories food like ice cream, soda and candy, potato is the worse food as it adds a pound in the weight of an individual each year. Besides, potato food like chips are advertised in such a manner that it becomes irresistible.

The study conducted by the Harvard University that the food we eat is responsible for making one fat rather than the habits or lifestyle. Therefore, the researchers of the study are promoting health foods like fruits, vegetables and are urging people to reduce their consumption of potatoes, sweet and red meat.

It has been revealed that for the study the concerned doctors analyzed changes in diet and lifestyle habits of 120,877 people. For up to two decades the weight of the participants was measured every four year. During the study it was found that the participants gained 17 pounds in twenty years.

The researchers found that potato chips were the biggest dietary offender. Each daily serving containing 1 ounce (about 15 chips and 160 calories) led to a 1.69-pound uptick over four years. That's compared to sweets and desserts, which added 0.41 pound. Soda added a pound over four years. Eating more fruits and vegetables and other unprocessed foods led to less weight gain, probably because they are fiber-rich and make people feel fuller.