Carbohydrates, often referred to as carbs, are one of the three primary macronutrients, along with proteins and fats, and they are a fundamental source of energy in the human diet. Carbohydrates are organic compounds composed of carbon, hydrogen, and oxygen atoms. They exist in various forms, including sugars, starches, and fibres.

Unit 2,

Reference: Oxford Concise Colour Medical Dictionary (7th Edition, Kindle Edition) Oxford University Press 2020 ISBN-13: 978-0198836629, p1120