Intermittent fasting shown no advantage over conventional calorie‑restriction diets

A systematic review of 22 randomized clinical trials involving nearly 2,000 adults with overweight or obesity found that intermittent fasting methods (time‑restricted eating, alternate‑day fasting, 5:2 diet) produced only a marginal weight loss advantage—about 300 g—over traditional calorie‑restriction diets, a difference that was not statistically significant. Researchers concluded that the primary determinant of long‑term success is adherence to any sustainable eating plan.

In Brazil, experts in metabolic medicine are emphasizing a broader, individualized approach to sustainable weight loss. They argue that focusing solely on weight overlooks important factors such as insulin resistance, inflammation, body‑composition changes, sleep, stress, hormonal balance and gut health. Data from a national health survey estimate that 38.4% of Brazilians have metabolic syndrome, highlighting the need for personalized protocols that preserve muscle mass and improve metabolic health rather than pursuing rapid weight loss alone.