Low-Carb and Ketogenic Diets
Low-carb and ketogenic diets consistently rank among the diets that really work for short-term weight loss. In a 2023 meta-analysis published in the BMJ, low-carb diets produced greater weight loss than low-fat diets at 6 and 12 months, with an average difference of around 2.2 to 4.5 pounds. The global low-carb market, valued at roughly $14 billion in 2023, is projected to grow at a CAGR of over 5% through 2030, according to Grand View Research. Companies such as KetoLogic and Perfect Keto have reported strong revenue growth tied to consumer demand for ready-to-drink ketone supplements and snacks. Forbes reports on the market expansion.
Despite short-term results, long-term adherence remains a challenge. A 2023 Stanford randomized trial found that after two years, both low-carb and low-fat diets led to similar average weight loss of around 13 pounds, with no significant difference between the two groups. The study also found that genetic patterns and insulin response did not reliably predict who would succeed on low-carb versus low-fat plans. Cell Metabolism published the Stanford trial.
Intermittent Fasting and Time-Restricted Eating
16:8 and 5:2 Protocols
Intermittent fasting has become one of the most searched diets that really work, with Google Trends data showing sustained interest since 2019. The 16:8 protocol, where eating is confined to an 8-hour window, is the most popular variant. A 2022 study in the New England Journal of Medicine found that time-restricted eating combined with calorie restriction led to a 3.5% body weight reduction over 12 months, similar to daily calorie restriction alone. Companies such as Zero and Life Fasting Tracker have built apps that help users track fasting windows, with combined downloads exceeding 10 million.
Regulatory scrutiny is increasing as intermittent fasting products grow. The SEC filings for companies selling fasting-related supplements show a shift toward clearer health claims and disclaimers. The FDA has not approved any fasting protocol as a medical treatment, but it has issued guidance on labeling for intermittent fasting products. SEC EDGAR database for company filings.
Mediterranean Diet and Plant-Based Eating
Long-Term Adherence and Heart Health
The Mediterranean diet ranks as one of the diets that really work for long-term weight management and cardiovascular health. In U.S. News & World Report 2024 rankings, the Mediterranean diet tied for first place in Best Diets Overall and Best Heart-Healthy Diets. A 2023 PREDIMED-Plus trial published in The Lancet showed that the Mediterranean diet plus calorie restriction led to an average weight loss of 5% body weight after one year, with sustained results at four years. The global Mediterranean diet market is estimated at $12 billion in 2023, driven by olive oil, nuts, and packaged meal kits from companies such as Marley Spoon and HelloFresh.
Plant-based diets are also gaining traction, with the global plant-based food market valued at $29.4 billion in 2023 and projected to reach $162 billion by 203