It is difficult to define how many carbs are in a low-carb diet. Low-carb diets may vary from person to person. The low-carb diet is used to lose weight quickly. The amount of carbohydrates a person needs depends on his or her BMR, or how many calories are required every day. It is based on a person's age, height, weight, and physical activities. If a person needs 2000 calories of energy every day, he or she should aim for around 250 grams of carbs. For such a person, a low-carb diet should be prescribed that is less than 250 grams of carbohydrates. This will help him lose weight much faster. Low-carb diets also help raise good cholesterol and lower bad cholesterol, blood sugar, and blood pressure. Triglycerides are bad cholesterol.