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Well, they don't exactly 'eat' it. Glucose (sugar used in cells) diffuses into the cells from blood plasma, aided by insulin. Once inside the cell, glucose moves to the mitochondria of the cell where cellular respiration (Krebs cycle) breaks the glucose down by the use of an electron transport chain, and the chemical energy released when the C-H bonds are broken in the glucose to form CO2 and H2O is stored in ATP molecules by a process called active phosporylation. It is a complex cycle, but the summary is:

Glucose (C6H12O6) molecules are broken apart to form wastes, CO2 and H2O. The C-H bonds in the glucose are rich in chemical energy, and the purpose of breaking the glucose down is to release that chemical energy and use it to add phosphate ions to AMP (adenosine monophosphate), making first ADP(adenosine diphosphate) and then ATP (adenosine triphosphate). ATP molecules hold the chemical energy in the bonds of the 2 phosphate ions that have been added to them in this process, and the cell can 'spend' that energy for metabolic reactions in the cell by breaking off the two phosphates, releasing that chemical energy into the reactions.

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12y ago
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Q: What helps your cells be able to eat the sugar needed for energy called?
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