I'm sorry to tell you that it's impossible to lose 40 pounds a week. This goal is too extreme and unhealthy, which may cause serious harm to the body. In general, the weekly weight loss should be controlled within the range of 1 ~ 2kg.

If you want to lose weight, you can try the following methods:

1. Make a reasonable diet plan: eat less high-calorie foods and eat more vegetables, fruits and rich foods in protein.

2. Proper exercise: Doing proper exercise every day can help you burn more calories, improve metabolism, help you lose weight and stay healthy.

3. Drink plenty of water: Drinking plenty of water can help you excrete waste from your body, increase satiety and reduce appetite.

4. Properly control the eating time: do not eat before going to bed, and eat regularly every day to ensure nutrient intake while avoiding overeating.

5. Keep your mind steady: It takes patience and perseverance to lose weight. Don't pursue quick results excessively, be steady in mind and lose weight steadily is more scientific.

Finally, remind everyone that weight loss must be reasonable and scientific, and don't lose weight blindly, so as not to cause harm to the body. If you are not sure about your weight loss plan, please consult a dietitian or doctor.