why do other macromolecules besides carbohydrates give us energy?
Answers
answer:While carbohydrates supply immediate energy for the body, lipids — a class of macromolecule — provide long-term energy storage. Lipids, more commonly known as fats, appear in many foods.
Answer:
Lipids in foods are those chemicals that are not soluble in water. The most important group of lipids in foods are fats and oils. Other lipids in foods are cholesterol and phospholipids but they make up a very small portion of the foods we eat. For example, we eat 50–100 grams of fat (including from oils) per day while we eat only about 300 mg of cholesterol and none at all if we follow a vegan diet. Due to the structure of fats and oils, there are lots of calories, and therefore energy, packed into their chemical structure, particularly in the fatty acid portions of the molecules.
Carbohydrates, on the other hand, are for the most part are just molecules based on glucose. Fewer calories, or energy, is available to the body from the metabolism of glucose compared to fatty acids. This is all due to the structure and biochemical metabolism of these food components which has been explained in detail in other posts. As said before, in every gram of fat or oils, there are approximately 9 calories, compared to only 4 calories in every gram of glucose or carbohydrate. Certain carbohydrates have even fewer calories that that due to the difficulty in digesting these carbohydrate (ex resistant starch and cellulose which is found in the cell walls of plants).
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