Primary, secondary, and tertiary sources may all be appropriately used, if (1) they are used without engaging in original research or synthesis and (2) if in the event of conflicts between sources they are treated with the appropriate deference to the better source.
There is some evidence that a low-carbohydrate diet may help people lose weight more quickly than a low-fat diet (31,32)âand may help them maintain that weight loss.
In 2007, the American Journal of Clinical Nutrition suggested that a low-carb diet consists of 50 to 150 grams daily. However, many research studies use diets with less than 100 grams of carbs daily to determine the benefits of low-carb diets, and some very-low-carb diets contain as little as 20 grams of carbs daily.