I went to the gym for a few days and didn't lose weight …

I think you can try swimming. Swimming is the best in fitness. It won't hurt any part of your body. But if conditions don't allow, the gym is also a good place, but we must stick to it. Losing weight means being thin all over. He won't lose weight! Eating nothing at night is still bad for your health. You can eat some fruit or something to supplement the trace elements lost in your body.