Answer
Most fad weight-loss diets, are not scientifically proven to work which is why they aren't very successful. These diets also do not create a healthy-eating lifestyle in the long term but might benefit your health in the very short term. A lot of these diets are also simple to apply in your life which is why they are so popular for a short time. These diets also tend to restrict important nutritional elements which are needed for your body to function.
Work Step by Step
See the above.
