Why Eating Early Benefits Glucose Levels: Insights from Recent Research

A recent study confirms an old piece of advice: eating dinner early is beneficial for health. Researchers from Universitat Oberta de Catalunya (UOC) and Columbia University found that consuming over 45% of daily calories after 5 p.m. raises glucose levels. This increase poses health risks, regardless of a person’s weight or body fat.

The study appears in the journal Nutrition & Diabetes. It suggests that meal timing affects glucose metabolism independently of calorie intake and weight. Researchers studied 26 participants aged 50 to 70, all overweight or obese, and some with prediabetes or type 2 diabetes. They divided the participants into two groups: early eaters, who had most calories before evening, and late eaters, who had a significant portion after 5 p.m.

Both groups consumed the same amount of calories and similar foods. However, late eaters showed poorer glucose tolerance and tended to eat more carbohydrates and fats in the evening.

Dr. Diana Díaz-Rizzolo explained that glucose metabolism declines at night due to reduced insulin secretion and changing cell sensitivity, driven by the body’s circadian rhythm.

Cultural factors also play a role in meal timing. Dietary habits vary widely globally. For instance, Mediterranean cultures often have their main meal in the late afternoon, while others eat dinner earlier. Future studies should consider these cultural contexts to improve dietary advice.

The study emphasizes focusing on meal timing for better health outcomes. Dr. Díaz-Rizzolo recommends consuming most calories during daytime, particularly at breakfast and lunch, and avoiding unhealthy foods, especially at night. This research could reshape how we think about eating patterns in relation to our health.