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Relying on very little evidence, the carnivore diet relies on ultra-high protein sources and nearly zero carbs.

A low-carb diet that’s very high in fat, the “keto” diet is also known for lowering blood sugar.

A diet that combines the low-carb features of the Atkins diet with a reduction in saturated fat for better heart health

The original low-carb dietary pattern centered on meat consumption, but it has evolved.

Precise levels of each aren’t as important as where they’re sourced.

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.