Losing weight is rarely as simple as 'calories in, calories out.' Here's why.
Our bodies evolved compensatory mechanisms to balance the energy required to exercise with the energy available for key biological processes.
I know that sounds like a small difference. However, look at the math this way: What if you ate 25 percent fewer calories every day? Scientific studies have shown overwhelmingly that a 25 percent reduction in daily calorie intake will significantly improve your health far more effectively than exercising. Therefore, the results of this new study provide a critical bit of information that should influence our expectations about exercise on general health.
Scientists have speculated that energy expenditure is not linear. A nine-year-old study of African hunter-gatherers discovered that people who regularly walked or jogged for hours burned about the same number of calories each day as relatively sedentary Westerners. Apparently, the active tribesmen's bodies compensated by reducing the overall rate of calorie consumption in order to avoid starvation while hunting.
As expected, more movement burns more energy. But the data revealed a surprising outcome. As each person exercised, they did not burn as many total calories as expected. In fact, most subjects burned only about 72 percent as many additional calories as would be expected given their level of activity.
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