The answer you recommended is completely wrong and misleading. He said that he had experienced it, too, and he would get fat if he didn't exercise. It can only show that he is a fat man with low metabolism. If he doesn't exercise, he will easily accumulate fat, which is not suitable for you at all. However, if you lose weight without exercise, you belong to a person with fast metabolism. Your fitness makes you stronger, because you have increased your muscles. If you don't exercise for a month or two, you will gain weight. But your body composition is changing, that is, if you don't exercise during this time, your fat will increase a little, and your muscles will decrease a little because you don't exercise, which is only complementary. Of course, we should combine diet and sleep. If you can't keep up with your diet and sleep, you will become thinner.