The post-lunch 'food coma' is primarily caused by a drop in blood sugar and the body's natural circadian rhythm, which dips around 2 PM.
Consuming heavy, carbohydrate-rich meals triggers a spike in insulin, leading to a subsequent crash that results in mid-afternoon brain fog and lethargy.
Nutritionists suggest opting for smaller, protein-balanced meals and staying hydrated to maintain steady energy levels throughout the workday.