
Weight loss is driven by expending more calories than are consumed. Losing 15 lbs. in a month, a rate higher than recommended, requires a net loss of 13,125 calories per week. The human body burns calories three ways: 1) your resting metabolic rate (approximately 70 percent), 2) caloric expenditure from the act of eating itself (about 10 percent), and 3) exercise (roughly 20 percent), according to Exercise ETC, Inc.
Step...