Carbohydrate
Definition
One of the three macronutrients, providing 4 calories per gram, serving as the body's primary and preferred source of energy.
Carbohydrates are organic molecules that serve as the body's main source of energy. They are classified as simple (sugars like glucose and fructose) or complex (starches and fiber). After digestion, most carbohydrates are converted to glucose, which fuels cells, muscles, and the brain.
Healthy carbohydrate sources include whole grains, fruits, vegetables, and legumes, which provide fiber, vitamins, and minerals. Refined carbohydrates like white bread, sugar, and processed foods cause rapid blood sugar spikes and offer little nutritional value beyond calories.
Carbohydrate needs vary by individual, activity level, and goals. Endurance athletes may need 3-5 grams per pound of body weight, while sedentary individuals may function well on 1-2 grams per pound. Low-carb and ketogenic diets restrict carbohydrates to shift the body's primary fuel source to fat.
Related Calculators
Related Terms
Macronutrients
healthThe three categories of nutrients that provide calories and energy: protein, carbohydrates, and fat, needed by the body in large quantities.
Glycemic Index (GI)
healthA ranking system from 0 to 100 that measures how quickly a carbohydrate-containing food raises blood sugar levels after eating.
Dietary Fiber
healthA type of carbohydrate that the body cannot fully digest, essential for digestive health, blood sugar regulation, and cholesterol management.
Calorie
healthA unit of energy used to measure the energy content of food and beverages and the energy expenditure of physical activities.
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