What Causes Blood Sugar Spikes After Eating?

Blood sugar spikes occur when your body breaks down carbohydrates into glucose faster than it can process them. Simple carbohydrates like white bread, sugary drinks, and processed foods digest quickly, causing rapid glucose absorption into the bloodstream. Your pancreas responds by releasing insulin, but this process takes 15-30 minutes to effectively lower blood sugar levels. High-glycemic foods (scoring above 70 on the glycemic index) trigger the most dramatic spikes. Portion size also matters - consuming large amounts of any carbohydrate can overwhelm your body's ability to regulate glucose. Individual factors like insulin sensitivity, meal timing, stress levels, and physical activity all influence how dramatically your blood sugar responds to food.