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Why is there a difference in available energy in saturated vs. unsaturated fatty acids?

On Wikipedia it states: In cellular metabolism, unsaturated fat molecules contain somewhat less energy (i.e., fewer calories) than an equivalent amount of saturated fat. Can someone explain why ...
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Energy in molecules

A textbook states: Fats also provide an efficient way to store energy over long time periods, since they contain over twice as much energy per gram as carbohydrates What's the chemistry ...
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