Rating the Diets: U.S. News and World Report Annual Rankings for 2023

Blog Post

Stephen W. Farrell, PhD, FACSM
The Cooper Team
January 5, 2023

It’s that time of year again! Countless numbers of individuals will make a resolution to lose weight in 2023.

It’s no secret to those of us with an interest in health and fitness that 70% of American adults are overweight or obese.* Obesity is strongly associated with a number of chronic conditions including cardiovascular disease, hypertension, metabolic syndrome, type 2 diabetes, sleep apnea, knee osteoarthritis, and some cancers.

Overweight in adults is defined as a body mass index (BMI) between 25.0 and 29.9 kg/m2, while obesity is defined as a BMI greater than or equal to 30 kg/m2. Use this link to calculate your BMI. Please note that BMI is not a valid indicator of body weight status for individuals who are extremely muscular. However, such individuals make up only a tiny portion of the U.S. population!  Obesity can also be categorized by a waist circumference greater than 35 inches in women, or greater than 40 inches in men.

During any given year, it is estimated that over 50 million Americans will be dieting. These numbers provide a rich and fertile environment for a seemingly endless number of popular diets, some of which are very questionable at best. Unfortunately, research shows that only 20% of dieters will be able to keep their lost weight off for 12 months.

Each year, U.S. News and World Report provides a tremendous public service by releasing their annual ratings of popular diets. For 2023, a team of 33 nutrition experts including Registered Dietitians, physicians, weight loss researchers, and nutrition scientists rated the effectiveness of 24 different diets in the following areas: overall score, overall weight loss score, and healthiness score.

Each of the areas was rated on a scale of 1-5, with 5 being the highest score. There were several categories of best diets, including best diets overall, best weight loss diets, best family-friendly diets, best diets for diabetes, and best diets for bone and joint health.

For those interested in weight loss, it is very important to note that the focus should be on long-term weight control rather than short-term weight loss. Additionally, since cardiovascular disease is the leading cause of death for U.S. men and women, whichever dietary approach is selected should be one that is rated highly as heart-healthy!

As you read through a brief summary of the various categories below, you will no doubt notice consistent trends for those diets rated highly or not-so-highly:

In the best diets overall category, the Mediterranean Diet led the way for the sixth consecutive year with an overall score of 4.6! The Dietary Approaches for Stopping Hypertension (DASH), and the Flexitarian Diet finished in a two-way tie for second place. These were followed closely by the Mediterranean-DASH Intervention for Neurodegenerative Delay (MIND) Diet, and the TLC Diet. At the other end of the spectrum, bottom dwellers included the Keto, Atkins, Optavia, Slimfast, and Raw Foods Diets with overall scores hovering around 1.8.

In the best diets for long-term weight loss category, the top finishers were the Weight Watchers, DASH, Mayo Clinic, TLC, and Flexitarian Diets. Among those pulling up the rear were the Atkins, Keto, Slimfast, and Raw Foods Diets.

In the best family-friendly diets category, there was a tie for first place for the Flexitarian and Mediterranean Diets. Close behind were the TLC and DASH diets. Among those who brought up the rear in this category were the Jenny Craig, Optavia, and Slimfast Diets.  

Because diabetes affects 11.3% of the U.S. population, best diets for diabetes was included as an additional category. The leaders were the DASH, Mediterranean, Flexitarian, and Ornish Diets. Bringing up the rear were the Paleo, Optavia, Raw Foods, and Slimfast Diets.  

Finally, in the best diets for bone and joint health category, the leaders were the Mediterranean, DASH, and Flexitarian Diets. Bottom dwellers for this category included the Atkins, Keto, and Slimfast Diets.    

You might be interested in some of the specific comments made within the report:

  • Mediterranean Diet: The bottom line is that according to years of research and evidence, primarily eating plant-based such as fruits and vegetables, while incorporating whole grains, beans, nuts, seafood, lean poultry and unsaturated fat from extra-virgin olive oil is incredibly good for overall well-being.
  • The DASH Diet is a flexible, balanced and heart-healthy eating plan promoted by the National Heart, Lung and Blood Institute to stop (or prevent) high blood pressure.
  • By eating more plants and less meat, studies show that people who follow the Flexitarian Diet may not only lose weight, but can improve their overall health by lowering their rate of heart disease, diabetes, and cancer.
  • Experts ranked the Keto Diet near or at the bottom of every category. An editorial appearing in JAMA Internal Medicine a few years ago concluded that “enthusiasm outpaces evidence” when it comes to a keto diet for treating obesity and diabetes.
  • The high-protein Paleo Diet is ranked poorly among U.S. News experts, who consider it too restrictive to be healthy or sustainable.
  • Proponents of the Raw Foods Diet say cooking destroys most of the vitamins in food and nearly all of the immune-boosting plant nutrients, but scientific evidence to support these claims is lacking. Most nutrition experts believe this low-calorie plan isn’t ideal.

Kudos to U.S. News and World Report once again for doing such a great job with this important annual project!


Best Diets: U.S. News and World Report. Published January 3, 2023.


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