Protein, carbohydrates, and fats are macronutrients that provide energy (calories) to the body. Here are the calculations for converting grams of each macronutrient into calories:
- Protein: Each gram of protein provides 4 calories
- Carbohydrates: Each gram of carbohydrates provides 4 calories
- Fats: Each gram of fat provides 9 calories
For example, if a food item contains 20 grams of protein, 30 grams of carbohydrates, and 10 grams of fat, the total number of calories from protein would be 20 grams x 4 calories/gram = 80 calories. The total number of calories from carbohydrates would be 30 grams x 4 calories/gram = 120 calories. And the total number of calories from fat would be 10 grams x 9 calories/gram = 90 calories. The total number of calories in the food item would be 80 + 120 + 90 = 290 calories.
It's also important to remember that calorie needs vary depending on factors such as age, sex, height, weight, and activity level. Consult with a registered dietitian or physician for personalized recommendations.