Fat provides more kcals per gram than carbohydrate or protein. Fat does not provide as much satiety as carbohydrate.
A carbohydrate is a biomolecule consisting of carbon (C), hydrogen (H) and oxygen (O) atoms, usually with a hydrogen–oxygen atom ratio of 2:1 (as in water) and thus with the empirical formula Cm(H2O)n (where m may or may not be different from n). However, not all carbohydrates conform to this precise stoichiometric definition (e.g., uronic acids, deoxy-sugars such as fucose), nor are all chemicals that do conform to this definition automatically classified as carbohydrates (e.g. formaldehyde and acetic acid).
The term is most common in biochemistry, where it is a synonym of saccharide, a group that includes sugars, starch, and cellulose.
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