Hormonal

Glucose tolerance decreases significantly from morning to evening, resulting in higher postprandial blood glucose levels in the afternoon and evening compared to the morning, driven by reduced insulin sensitivity and secretion.

Your body handles carbohydrates better in the morning. If you eat the same meal in the evening, your blood sugar will spike significantly higher (by 30-50 mg/dl) than if you ate it in the morning, even if you fasted for the same amount of time. Prioritize higher-carb meals earlier in the day to minimize glucose spikes.