Time-restricted eating and metabolic health: implications for nutritional strategies and weight loss

Time-restricted eating (TRE) has emerged as a promising dietary strategy within the field of chrononutrition, focusing on the temporal organization of food intake rather than caloric restriction alone. This mini review summarizes current evidence on the effects of TRE on body weight, metabolic health, and circadian regulation. Experimental and clinical studies suggest that TRE, typically involving daily eating windows of 6-10 h, may promote modest weight loss and improvements in glycemic control, insulin sensitivity, and lipid profile. Some effects have been observed even in the absence of significant weight loss, supporting a potential role of meal timing in cardiometabolic regulation, although findings are still inconsistent. Data indicates that many of the identified advantages appear to be largely driven by spontaneous caloric restriction, with several randomized controlled trials showing no additional benefits of TRE compared to conventional hypocaloric diets. The timing and duration of the eating window might influence outcomes, with early TRE and moderate eating windows having more favorable results than delayed or extreme protocols. Circadian biology provides a mechanistic framework for understanding these effects, as alignment between feeding-fasting cycles and endogenous rhythms can enhance metabolic efficiency. Most studies do not account for individual chronotype, and evidence on circadian, inflammatory, and behavioral outcomes remains limited. TRE represents a feasible and non-invasive dietary approach with potential health benefits, particularly when compared to unrestricted eating patterns, although its superiority over caloric restriction alone has not been fully elucidated. Future research should prioritize long-term interventions, standardized protocols, and the integration of circadian factors, particularly chronotype, to better elucidate the role of TRE in metabolic health and clinical practice.