Eating only one meal a day and losing weight by exercise may have some weight loss effects in the short term, but in the long run, this practice may be unhealthy, because the body needs normal nutrient intake to maintain normal metabolism and function. At the same time, excessive dependence on exercise to lose weight may lead to excessive fatigue, muscle injury and metabolic disorder.

To achieve healthy weight loss, it is recommended to take a comprehensive approach, which can refer to the following points:

1. Maintain a balanced diet: take in proper amount of protein, carbohydrates, healthy fats, vitamins and minerals.

2. Control food intake: control calorie intake and reduce the intake of high-calorie, high-fat and high-sugar foods.

3. A variety of exercise combinations: You can try a comprehensive exercise of aerobic exercise, strength training and flexibility training, and don't rely on only one exercise method.

4. Balanced rest and sleep: Reasonable arrangement of rest time and adequate sleep are conducive to physical recovery and metabolic regulation.

5. Seek professional guidance: consult a health expert, sports coach or dietitian to make a personalized weight loss plan.