First of all, you should control your mouth. You are fat because you eat fast food, so you should stop eating fast food. Generally speaking, if you eat too much fast food, you will gain weight, which is very unhealthy. Fast food is high in fat, and it is easy to get fat if you eat too much. In the future, you can eat some foods with low fat content instead of fast food, and keep your mouth shut. In this case, you can stop gaining weight even if you can't lose weight. You can even eat less, eat more fruits, oats, vegetables, etc., without drinking. Drink more boiled water to promote digestion, and it will be fine. Then don't eat too much every day. You can't eat any more. I can't digest if I eat too much. No food, no energy to lose weight. So be sure to control your appetite, don't be lazy, and don't think about eating fast food occasionally. You must remember that the first time, there will be a second time, many times, so you must have perseverance and control yourself.

Secondly, I think people who eat fast food are generally lazy, so I guess you don't exercise either. You just sit there after dinner and don't move. How can you not be fat? So you can go out for a run every morning and evening, go out for a walk after dinner, often go to the gym and find a coach to lose weight reasonably and healthily. Don't exercise, but don't exercise too much, otherwise the fat may not be reduced, and it will become muscle, which is not worth the loss.

I think you can buy your own food every day and then cook for yourself. You can walk more when you buy food, just to exercise, and you can wash the dishes yourself after dinner, just to exercise yourself after dinner. This will not only cost less, eat well, but also make you exercise, kill two birds with one stone. Why not?