By doing this, yes, you will lose weight temporarily. You will also become very tired, vitamin deficient, and unhealthy. Once you eventually go back to eating normally again, you will gain all the weight back instantly. Unfortunately, yes, eating 500 calories a day is not healthy, unsafe, and can become extremely detrimental to your body. In order to lose weight, you are supposed to be eating around 1800 calories a day - this number is a generalization. Calorie consumption is typically based off your age and gender. Also, do not take "Alli". Despite popular belief, it actually does absolutely nothing. Instead of calorie counting, try eating 100% whole grain products, fruits, vegetables, lean meats, and low fat dairy products. Go for a walk or bike ride about 3 times a week as well. Weight loss is a long process and should always be done properly.
Nutrition & Dietetics Major