营养和消化 大学生物 Nutrition and Digestion.ppt

* Student Misconceptions and Concerns 1. Given new choices and greater freedom away from home, young college students frequently experiment with their diets. The details on nutritional requirements are worth additional emphasis in lecture. 2. Advertising frequently creates false expectations about simple shortcuts to dieting. Consider emphasizing the importance of a well-balanced diet and exercise. 3. Students may struggle with the concept that a pound of fat contains more than twice the calories of a pound of sugar. It might seem that a pound of food would simply add a pound of weight. (You might wish to remind them that fiber and water have no caloric value, but still add to the weight of food.) They may also have never understood the concept of dietary calories, but just tried to avoid fatty foods. Consider encouraging class discussions that explore student misconceptions about calories, body weight, and healthy diets. Teaching Tips 1. One of the challenges zookeepers face is to determine the essential nutrients required in the diets of exotic animals. Without an appreciation of the natural diet of a rare animal, certain dietary requirements may remain undetected, resulting in malnourishment. 2. The U.S. Department of Health and Human Services provides their Dietary Guidelines for All Americans at /dietaryguidelines. * Anorexia nervosa神經性厭食症 Bulemia暴食症 * Figure 21.16 Essential amino acids from a vegetarian diet * Student Misconceptions and Concerns 1. Given new choices and greater freedom away from home, young college students frequently experiment with their diets. The details on nutritional requirements are worth additional emphasis in lecture. 2. Advertising frequently creates false expectations about simple shortcuts to dieting. Consider emphasizing the importance of a well-balanced diet and exercise. 3. Students may struggle with the concept that a pound of fat contains more than twice the calories of a pound of sugar. It might seem that a pound of food wo