Final answer:
To calculate the amount of calories or grams when given the macronutrient content of a food or meal, multiply the grams of each macronutrient by their respective caloric values per gram and sum them up.
Step-by-step explanation:
The macronutrients in food are proteins, carbohydrates, and fats or oils. Proteins provide about 4 Calories per gram, carbohydrates also provide about 4 Calories per gram, and fats and oils provide about 9 Calories/ g.
Nutritional labels on food packages show the caloric content of one serving of the food, as well as the breakdown into Calories from each of the three macronutrients.
To calculate the amount of calories or grams when given the macronutrient content of a food or meal, you can multiply the grams of each macronutrient by their respective caloric values per gram and sum them up.