A Calorie Calculation is an effective way to lose weight
Nowadays, all packaged foods contain a nutrition facts label, so it is so easy to know the amount of calories intake from each food ingredients like fat, protein, and carbs which they called macronutrient.
Suppose the nutrition facts label as shown below:
In addition, the caloric value for the macronutrient:
So to calculate the caloric value for the nutrition contents:
Fat = 12 gram * 9 Kcal/gram = 108 Kcal
Carbohydrates = 25 gram * 4 Kcal/gram = 100 Kcal
Protein = 3 gram * 4 Kcal/gram = 12 Kcal
Total Caloric value per serving = 220 Kcal
Serving per container = 4
Total Caloric value per container = 4 * 220 Kcal = 880 Kcal
Finally, according to dietitians and other food experts, 46-65% of the total calories you consume on a daily basis should come from carbohydrates, 10-35% from protein, and 20-25% from fats. The recommended daily value (%DV) column featured in the nutrition facts will tell you how much of those proportions you’re getting from the item per serving.
See also,
http://bit.ly/2K3nzpq