There are people who ask me why even if they eat little or less than they should, they gain weight . Why is this happening? I have identified three fundamental reasons that lead us to eat little and gain weight. This is a huge problem, which affects our life (think waking up in the morning with the idea that you can never eat what you want during the day) in many ways, including socially. Going out with friends, eating a pizza on your own, for example. But above all, it risks becoming a health problem : prolonged underfeeding can lead to serious nutritional deficiencies, hormonal imbalance, a worsening of the immune system.

Why, we hear that you need to eat little to live long! Yes, but we are talking about moderation at the table, a few days of fasting or undernutrition (fasting as Dr. Veronesi professes it is one day a week , Dr. Longo’s system provides for about five days of reduced nutrition per month , or less. , not every day).
And the solutions to try to fix the problem. I anticipate that you will not like some of these solutions at all! 
But let’s first come to the reasons why it is possible to eat little and gain weight all the same. 

WHY DO I EAT LITTLE AND FATTY?
1) Because your metabolism is slow: Many people believe that to lose weight you need to eat less, and move more. In short, obesity can be defeated simply by starving, and if someone is obese and overweight, the fault lies solely with him. In fact, genetics greatly influence both our metabolism and the way we store fat. Even our family history, therefore an inheritance, is an important fact to understand why today we have problems losing weight. Not knowing instead is a much more serious problem. Knowing this means not resigning oneself to being overweight, but looking for a more intelligent strategy to cut calories indiscriminately, for example by associating adequate training with a healthy, balanced diet with a minimum calorie cut, and placing oneself in the perspective of gradually get to lose weight and look better, beyond easy slogans. But when there are no genetic reasons for being overweight, it is the constant diets that cause us to have a slow metabolism, and even some cases of overtraining lead to metabolism problems. In short: we must not think that if we are overweight it is because we eat badly. Continuous diets also help slow down our metabolism. Cutting too many calories, diets lower in calories than those required by our basal metabolism, exercising for hours every day, cutting too many foods from our life: all things that contribute to making us fat in the long term. The solution? Return to a normocaloric diet according to our needs perhaps with a reverse diet, and, after a few months (it can even be a year), make a cut of about 15% on our daily calories. In parallel, train three times a week, maximum four.