Mayo Clinic explains a typical daily limit for a low-carbohydrate diet ranges from 60 to 130 grams. These carbohydrates account for 240 to 520 calories. Very low-carb diets restrict carbohydrates to 60 or less per day, but normal dietary guidelines for Americans dictate 225 to 325 grams of carbs per day, or between 900 and 1,300 calories, for a 2,000-calorie diet.
Natural foods that contain carbohydrates include grains, fruits, nuts, vegetables, milk, seeds and legumes. Complex carbs and fiber are found in whole grains and legumes. Simple carbs are in milk and fruit. Manufacturers add refined carbs, such as flour and sugar, to foods. Mayo Clinic indicates examples of these manufactured foods include cookies, cakes, candies and sodas.
Some low-carb diets restrict carbohydrates initially and then gradually add them later. Mayo Clinic explains that these diet plans aim to lower insulin levels so that the body burns fat for energy instead of digested sugars. Lower fat levels lead to weight loss in many patients, according to Mayo Clinic.
WebMD states people on low-carb diets should take vitamin supplements with B vitamins and folic acid. Many B-complex vitamin supplements have folic acid in them already. The medical website recommends 400 micrograms of folic acid daily. Low-carb dieters may also take a multivitamin and a potassium supplement to make up for lost nutrients.