Energy Balance

The correct term to describe food energy is kilocalorie (kcal). However, kcals and Calories (with a capital "C") are used interchangeably. J

Figure 1-1. Energy Balance: Intake vs. Output

Intake = 3000 kcal Output = 3000 kcal Weight Maintained
Intake = 4000 kcal Output = 2000 kcal Weight Gain

Intake = 2000 kcal Output = 3000 kcal Weight Loss

Taken from FI Katch and WD McArdle. Nutrition, Weight Control, and Exercise, 3rd ed. Philadelphia; Lea & Febiger, 1988.

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