Wax gourd is really a good food to lose weight. But the mechanism of losing weight is like this. Only when the calories absorbed by the human body are less than the calories you consume every day can you lose weight.
So the correct way to lose weight should be: aerobic exercise+proper diet.
It is not a healthy way to lose weight just by dieting or taking diet pills.
Eating only melons every day will cause malnutrition.