Not to say that eating one will make you fat, you should combine your overall weight loss plan. I don't know if you can put butter in roasted corn. Eating corn itself won't make you fat. After all, it is coarse grains and there are many trace elements. Of course, if you only eat one, you will get fat if you don't control what you eat. When you lose weight, the best food intake is steamed bread. When you are hungry, you should eat more white steamed bread, which is full and not fat. It is better to eat less fried and baked goods.