It blocks absorption of fat. It can be ordered on-line. All calories are not equal. Calories taken early in the day are less harmful because you have time to burn them off. If you are going to eat one meal a day it should be breakfast.
Many people eat a big dinner and go to bed shortly thereafter.
Gradual weight loss is the key to any successful program. It is not possible to lose the amounts claimed in the magazines. One pound of fat contains approximately three thousand calories, so the loss of even two pounds per week provides almost one thousand calories a day. A good rate of weight loss is one to two pounds per month. There are some hormonal causes of obesity, including hypothyroidism.