Research indicates that consuming most daily calories earlier boosts glucose regulation in prediabetic and type 2 diabetic adults, highlighting the potential health benefits of aligning eating patterns with the body clock.
Eating most of the day’s calories earlier may be better for blood sugar control than leaving a large share for the evening, according to research led by Diana Díaz Rizzolo of the Open University of Catalonia and carried out at Columbia University Irving Medical Center in New York. The study, published in Nature’s Nutrition & Diabetes, found that people who consumed more than 45% of their daily energy intake after 5 p.m. showed worse glucose tolerance, even when weight, body fat and overall calorie intake were taken into account.
The research involved 26 adults aged 50 to 70 who were overweight or obese and had prediabetes or type 2 diabetes. All participants ate the same foods and the same number of calories, but at different times of day. Those who concentrated more of their intake earlier in the day had better glucose handling than late eaters, suggesting that meal timing itself can influence metabolism, not just what and how much people eat.
That finding fits with a broader body of evidence on chrononutrition, the study of how eating patterns interact with the body clock. A trial in Nutrients found that dinner at 6 p.m. led to better 24-hour blood glucose control than the same meal eaten at 9 p.m. Research in JAMA Network Open also linked earlier eating start times with lower fasting glucose and less insulin resistance in more than 7,600 people. Other studies have reported that evening meals can produce higher post-meal blood sugar than identical meals eaten at breakfast, and that late-night dinners can worsen glucose and insulin responses in people with type 2 diabetes.
The practical message is straightforward: if possible, make breakfast and lunch the biggest meals of the day and keep evening intake lighter. Díaz Rizzolo’s team also advised limiting ultra-processed foods, fast food and carbohydrate-heavy meals late in the day. While more research is needed, the overall evidence suggests that an earlier dinner may be a simple way to support better metabolic health.
Disclaimer: This content is for informational purposes only and is not intended to be a substitute for professional medical judgment, advice, diagnosis, or treatment.
