Since 1860, and more recently, in 1972, low carbohydrate (low-carb) diets have been a strategy for weight loss. Today, there continues to be an interest in low-carb approaches. While all low-carbohydrate approaches reduce the overall intake of carbohydrates, no clear consensus on what defines a low-carb diet exists. There are 3 macronutrients—carbohydrates (4 kcal/g), fat (9 kcal/g), and protein (4 kcal/g)—found in food. Therefore, studies have defined low carbohydrate as a percent of da...| www.ncbi.nlm.nih.gov