Best Fast Weight Loss Diets 2023

U.S. News ranked top fast weight loss diets for 2023. While effective for quick results, these plans may lack health and long-term sustainability. 

Keto diet 

Keto diet, No. 1 for rapid weight loss, focuses on high-fat, low-carb meals inducing ketosis. Not recommended long-term due to nutritional limitations. 

Mayo Clinic Diet

Mayo Clinic diet, emphasizing balance and customization, offers a medical-backed weight-loss plan. Expect 6-10 pounds in the initial two weeks and steady progress thereafter.

South Beach Diet

The South Beach diet promises rapid weight loss by emphasizing "good" carbs and fats. Initial phases encourage significant weight loss, but long-term adherence may pose challenges.

WeightWatchers Diet

WW's point system allows flexible eating, claiming 2 pounds per week weight loss. Studies support results, emphasizing balance and sustained success through built-in support. 

Volumetrics Diet

Volumetrics diet promotes weight loss with low-calorie, nutrient-dense foods, teaching portion control. Emphasizing filling, low-calorie options leads to significant initial weight loss.

Atkins Diet

The Atkins diet promises rapid weight loss by limiting carbs, emphasizing protein and fat. Short-term studies show results, but the method relies on water loss and may not be sustainable for long-term health. 

Jenny Craig Die

Jenny Craig offers a structured diet plan with prepackaged meals for gradual weight loss. Emphasizing healthy habits, portion control, and personal coaching, it aims for sustainable well-being.


Nutrisystem offers prepackaged meals for easy weight loss, praised for simplicity and safety. While helpful initially, monotony may arise over time.


Medifast, a low-calorie, low-carb diet, achieves weight loss with prepackaged "Fuelings" and one daily meal, totaling 1,000 calories. OPTAVIA follows a similar approach.


SlimFast promotes quick calorie reduction for fast weight loss using shakes and meal bars. Effective for around 20 pounds in 8-10 weeks, but lacks in heart health and long-term sustainability. Some use it for occasional maintenance after weight loss. 

Nutritarian Diet

Nutritarian diet by Dr. Joel Fuhrman promotes plant-based, nutrient-rich foods for weight loss. Avoiding processed items leads to short-term success, with a 20-day detox promising 10-pound loss by eliminating unhealthy foods.


Noom's app focuses on meal logging, weight, and exercise with personalized coaching. Emphasizing caloric density, it promotes quick weight loss through fruits, veggies, and exercise. Average users may lose 15 pounds in the 16-week plan.

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