Fad diets are not the best way to lose weight. These diets often promise quick weight loss if you strictly reduce what you eat or avoid some types of foods. You may lose weight at first, but most people quickly get tired of these diets and regain any lost weight.
Fad diets may be unhealthy, as well. They may not provide all of the nutrients your body needs. Also, losing more than three pounds a week, after the first few weeks, may increase your chances of developing gallstones (solid matter in the gallbladder that can cause pain). Research suggests that safe weight loss involves combining a reduced-calorie diet with physical activity to lose 1/2 to 2 pounds per week. Make healthy food choices. Eat small portions. Integrate exercise into your daily life. These habits can help you lose weight and keep it off.
Source: National Institute of Diabetes and Digestive and Kidney Diseases