A new understanding of nutrition and how our bodies use calories from food explains why balancing diet and exercise is much more complicated than you might think
WHEN you are navigating the complex world of nutrition, the calorie feels mercifully simple. A straightforward measure of the energy in our food, calories sit at the heart of conventional weight control advice. Consume too many, or fail to burn enough, and you will put on weight. Want to slim down? Eat less and move more. As the saying goes, “a calorie is a calorie is a calorie”. Dig a little deeper, however, and you find it isn’t that simple.
This idea of the body as a furnace and food as its fuel was popularised by Wilbur Atwater in the 19th century. He deduced that there are three main components, or macronutrients, with which we can calculate the calorie content of any food:
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