On the first day with a dynamic blood glucose monitor, one can discover a common fact: 40-60 minutes after a meal is the peak for blood sugar levels; eating more carbohydrates and sugar will cause blood sugar to rise quickly. Also, during the warm-up phase of exercise, blood sugar will also rise slightly. If a meal consists only of vegetables and meat, without rice/carbohydrates, the blood sugar fluctuation 40-60 minutes after the meal is also very small.