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β-oxidation of odd-numbered chains 3.6 Oxidation in peroxisomes 3.7 Energy yield 4 Synthesis 4.1 Elongation 4.1.1 Condensation 4.1.2 Reduction of acetoacetyl ACP 4.1.3 Dehydration 4.1.4 Reduction of crotonyl ACP 5 See also 6 References 7 External links [edit] fish oi Fatty acids as an energy source Fatty acids, stored as triglycerides in an organism, are an important source of energy because they are both reduced and anhydrous. The energy yield from a gram of fatty fish oi acids is approximately 9 kcal (39 kJ), compared to 4 fish oi kcal/g (17 kJ/g) for proteins and carbohydrates. Since fatty acids are non-polar molecules, they can be stored in a relatively anhydrous (water free) environment. Carbohydrates, on the other hand, are more highly hydrated. For example, 1 g of glycogen can bind approximately 2 g of water, which translates to 1.33 kcal/g (4 kcal/3 g). This means that fatty acids can hold more than six times the amount of energy. Put another way, if the human body relied on carbohydrates to store energy, then a person would need to carry 67.5
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