Final answer:
A calorie is not a calorie because it refers to the energy in food, but not the nutritional value. Different foods provide different nutrients, so it's important to choose nutrient-rich options. Dr. Robert Lustig is known for highlighting this concept.
Step-by-step explanation:
A calorie is not a calorie because it refers to the amount of energy in a unit of food, regardless of the food or nutrient source. However, this does not mean that all calories are equal in terms of their nutritional value. Different foods provide different types and amounts of nutrients, which are essential for maintaining good health.
For example, if someone needs 2,200 calories per day, consuming those calories from candy and French fries will result in a less nutritious diet compared to consuming the same amount of calories from a balanced meal consisting of salad, bread, and chicken.
Dr. Robert Lustig is known for emphasizing that a calorie is not just a calorie and that the source of calories is important for overall health.