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Calories and Nutrition

Human body needs energy to function. The measure of energy is Calorie. The amount of energy needed to function depends on the gender, age, activity level, the health itself of the person and even the type of food being consumed.

On average, an adult needs  17 to 18 calories per day per pound of body weight. Therefore, an 130-pound person needs 2,300 calories to maintain the weight. If one wants to lose weight, they must reduce the amount of calories consumed, and increase the rate of caloric consumption through exercise. The calories not used by the body are stored as fat.

Number of calories in the food depends on its composition.
4 Calories per each gram of Carbohydrates. What are Carbohydrates (Carbs)?
4 Calories per each gram of Proteins. What are Proteins?
9 Calories per each gram of fat.  What are Fats?

According to the National Academy of Sciences' Institute of Medicine following guidelines should be followed as a percentage of total calories consumed per day.
Carbohydrates: 45% to 65%... 55% nominal
Protein: 10% to 35%... 15% nominal
Fat: 20% to 35% (maximum)... 30% nominal