The best diet for weight loss is one in which you take in fewer calories than you expend every day. And one that you can stick to. We do know extreme diets that eliminate whole categories of foods, leave you hungry and unsatisfied and can slow your metabolism, making it harder to lose that excess weight. Fad diets do not work in the long run.
In order to sustain permanent weight loss you need to make healthy lifestyle choices, including a diet based on vegetables, fruits, lean proteins and some whole grains and healthy fats. Make sure you watch your portion sizes! Healthy choices have calories too.
Regular exercise is also important to lose weight or maintain a healthy weight. You should aim for 1 to 2 pounds weight loss a week. And studies prove building in diet days off help you stick to your plan and actually lead to more weight loss.