Sugary foods, such as cornflakes with two spoonfuls of sugar, accompanied by a waffle and maple syrup, had a high GL and led to a slump in performance by late morning.

• 放两匙糖的脆玉米片，外加华夫饼干和枫糖，这样的含糖食品血糖负荷高，因此导致人们在临近中午时表现出精神倦怠、靡不振的样子。