A gram of fat stores more energy than a gram of starch due to more C-H bonds within fat molecules relative to starch molecules.
Fats are the components of food that sore high amount of energy. Chemically, fats are the esters of fatty acids. The intake of high fat food can be stored inside the body and therefore can be harmful. The foods rich in fats are: butter, oil, nuts, meat, seeds, etc.
Starch is a type of polysaccharide. It is the primary source of energy in various animals and humans. The monomeric unit pf starch is glucose. Starch is also the food form produced by all the plants and stored as energy.
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