Harvard Health Content API

The app-based 16-week personalized diet and workout plan helps control calories.

Now in its 20th year, the plan helps dieters identify good carbs versus bad carbs, with a restriction on saturated fats. Like Atkins, there is an initial phase that emphasizes lean protein.

Numerous small servings lead to dramatic weight loss — that’s hard to keep off.

The WW points system emphasizes good food choices.

The volumetrics diet emphasizes foods with a low calorie density and a high water and fiber content. It’s hard to follow but evidence it works is strong.

Heavily dependent on the age-old food pyramid, the Mayo diet emphasizes what, and in what amount, you should consume. Physical activity is part of the plan.

This diet is designed for people diagnosed with irritable bowel syndrome (IBS).

Best for people diagnosed with celiac disease, the GF-free diet is also appropriate for people who believe they have a non-celiac sensitivity to wheat.

Not just a diet, this cholesterol-fighting diet includes an exercise regimen and weight control.

This cholesterol fighter restricts consumers to 2,000 calories per day from a variety of plant food and soy protein.