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fat
Fats (lipids) offer the most concentrated energy source (i.e the most kilojoules of energy per gram, compared with other nutrients).
Orcas eat shark liver because it is a nutrient-rich food source that provides them with essential fats and energy.
Sugar.
fats
fats
fats
The most highly concentrated source of energy in the body is Adenosine triphosphate (ATP), which is produced in the mitochondria. ATP is the primary energy currency for cellular processes and is used for muscle contraction, nerve signaling, and biochemical reactions. It provides a quick burst of energy for immediate use by cells.
Carbohydrates provide the most energy in wholemeal bread. When consumed, carbohydrates are broken down into glucose which is the body's main source of energy.
Adenosine triphosphate (ATP) is considered the most concentrated source of stored energy in cells. ATP stores energy in the form of high-energy phosphate bonds that can be readily broken to release energy for cellular processes.
Carbohydrates supply glucose as the main source of energy for the body.