Low-carb or low-fat or neither?
There are two basic arguments around weight-gain or loss. The first is that it doesn’t matter exactly what you eat because a calorie-is-a-calorie regardless of where it comes from. The second is that the macronutrient breakdown (fats, proteins, carbs) does matter because they have different effects on the hormones that determine when fatty acids are absorbed by fat cells and when they are released for energy.
Kevin Hall, a senior investigator at the National Institute of Diabetes and Digestive and Kidney Diseases, designed two studies in an attempt to test both hypotheses.
“The argument is that people are consuming too many carbohydrates, which drive up insulin levels in the blood,” Hall told the Centre for Science in the Public Interest last week.
“Insulin causes the body’s fat cells to suck in too many calories, and because calories are trapped in the fat cells, the rest of the body is starving. That makes you hungrier, so you eat more calories.”