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According to the 2010 Dietary Guidelines for Americans, carbohydrates should make up 45 to 65 percent of a person's total daily calorie intake. Any amount less than this could be considered low carb. For someone consuming 2,000 calories a day, this is about 225 to 325 grams of carbohydrates per day. Most low-carb diets limit carbohydrate intake to between 50 to 150 grams per day, depending on the diet.
The American Academy of Family Physicians defines low-carbohydrate diets as diets that restrict carbohydrate intake to 20 to 60 grams per day, typically less than 20% of caloric intake. The body of research underpinning low-carbohydrate diets has grown significantly in the decades of the 1990s and 2000s.