Size of Meal

Another factor that influences alertness and performance is the size of a meal. Large lunches containing 1,000 calories have been associated with decreased performance in the afternoon. Such high-calorie lunches tend to be high in fat. A lunch consisting of a double hamburger, french fries, and a shake would fit into this category. The size of a meal makes a difference because fat slows down absorption, and because blood flow to the stomach is increased for a longer period of time, resulting in less blood flow to the brain. The result is to feel sleepy and sluggish.

calorie: unit of food energy fat: type of food molecule rich in carbon and hydrogen, with high energy content absorption: uptake by the digestive tract

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