It is difficult for a person to gain weight on a normal diet unless he consumes more calories than he should, and this weight gain is also very slow. For example, if you eat more than your normal diet every day, according to the weight of a ball of vanilla ice cream online, it is 55 grams and the calories are 97 calories. Even if you eat five balls a day, the extra calories are 485 calories. A person's kilogram is equivalent to 7700 calories, which can be calculated as follows: you have to eat for half a month to gain a kilogram ~ ~