Eat alternately for two days,
Eat a normal diet on the first day (don't overeat) and only eat whole wheat bread on the second day. One day to ensure nutrition, one day to burn fat, so that two days alternate, mental stress will not be too great, not very sad. You can lose 5 kilograms in 2-3 weeks. You'd better do more exercise. But if you don't insist, there will always be hunger. To lose weight successfully, you must have perseverance.
Wish you success!