This narrative review examines how meal timing affects people with obesity, type 2 diabetes, hypertension, and cardiovascular disease. It looks at whether eating later in the biological day or night changes how the body handles food compared to earlier energy intake. The review draws on observational studies, randomized trials, and mechanistic research to build its picture.
The analysis found that eating later in the day is associated with impaired postprandial glucose regulation. It also shows reduced insulin sensitivity and altered lipid handling. These changes are linked to adverse cardiometabolic profiles. These effects appear to happen regardless of what is eaten or how much energy is consumed.
In contrast, eating patterns aligned with endogenous circadian rhythms show metabolic favorability. This includes earlier energy intake and avoiding late-night eating. The review notes that current data lack absolute numbers and specific effect sizes. It also highlights a need for long-term, diverse human studies to clarify the role of chrononutrition in disease prevention.