As a health and fitness expert, I can tell you that while it's possible to lose weight quickly, doing so in such a short time frame is not recommended. Losing 7 pounds in 3 days would mean losing weight at an extremely rapid rate, which is not only unlikely but also potentially dangerous to your health. Weight loss goals should be realistic and safe. Generally, a healthy rate of weight loss is about 1 to 2 pounds per week, which is achievable through a combination of a balanced diet and regular exercise. Rapid weight loss can lead to a loss of lean muscle mass, nutritional deficiencies, and other health problems. To put it into perspective, to lose 1 pound of body fat, you would need to create a calorie deficit of approximately 3,500 calories. This means reducing your daily calorie intake by about 500 calories for a week. Attempting to lose 7 pounds in 3 days would require an unsustainable and unhealthy calorie deficit. In summary, while you might see some initial weight loss by severely restricting calories, it's not a sustainable or healthy approach to long-term weight management. read more >>

You will likely lose weight on any diet if you eat less than 910 calories a day. But losing 10 pounds in 3 days is both unlikely and unhealthy. To lose just 1 pound of body fat, you need to reduce your daily calories by about 500 a day for a whole week. That's giving up 3,500 calories over the course of 7 days.read more >>