Myth that certain foods, like grapefruit, celery, or cabbage soup, can burn fat and make you lose weight…, is that true??

Fact:
No foods can burn fat. Some foods with caffeine may speed up your metabolism (the way your body uses energy, or calories) for a short time, but they do not cause weight loss.
Tip:
The best way to lose weight is to cut back on the number of calories you eat and be more physically active.

Source:
U.S. Department of Health and Human Services
NATIONAL INSTITUTES OF HEALTH
NATIONAL INSTITUTE OF DIABETES AND DIGESTIVE AND KIDNEY DISEASE (NIDDK)
Weight-control Information Network (WIN)