Postprandial somnolence occurs one to two hours after heavy meals due to gut signals, hormonal shifts, and parasympathetic nervous system activation.
High intake of refined carbohydrates causes reactive hypoglycemia, where insulin spikes lead to a sudden drop in blood glucose and subsequent fatigue.
Dr. Eileen Canday of Sir HN Reliance Foundation Hospital advises that persistent fatigue after meals may indicate underlying issues like insulin resistance or type 2 diabetes.