Strengthen aerobic exercise (jogging, jogging, swimming) for more than half an hour (it takes more than 20 minutes for the body to mobilize and decompose fat).

You can increase your exercise without changing your diet. Or eat less without increasing exercise. Or both, diet and exercise.

But generally fat people don't like sports, so don't let yourself have no fun at all. I suggest giving up the idea of [skipping dinner] because it is too difficult to insist.