Alcohol is categorized as which type of substance in terms of energy contribution?

Alcohol is categorized as a non-nutrient because, while it does provide energy—specifically about 7 calories per gram—it does not contribute essential nutrients that the body requires for proper functioning. Nutrients are substances that provide nourishment essential for growth and the maintenance of life, including carbohydrates, proteins, fats, vitamins, and minerals. Since alcohol lacks vitamins, minerals, and other beneficial components that nutrients offer, it does not fall into the same category as essential dietary components.

Additionally, although alcohol can provide energy, it is often considered an empty calorie source because it does not supply the body with any of the essential nutrients needed for health—hence, it is classified as a non-nutrient. The metabolization of alcohol can also interfere with the body's ability to utilize other nutrients effectively, further solidifying its classification as a non-nutrient substance.