Calories measure the amount of energy stored in a food.
All calories come from either carbohydrates, proteins, fats or alcohol. Most children, teenage girls, active women and many sedentary men. To calculate your personal calorie requirements a little more accurately, you might want to try the University of Minnesota's K-Calculator. However, if you habitually consume more calories than your body can burn off, you will gain weight, and may become obese. Complications from obesity include high blood pressure, heart disease, diabetes, cancer and degenerative arthritis.