Energy Needs And Body Composition

Per unit weight, fat provides much more energy than any other storable biochemical fuel available. The use of 1 g of fat will yield around 9.2 kilocalories (or 38 kilojoules) of energy, compared with only about 1.3 kcal (5.3 kJ) from 1 g of protein or 1.0 kcal (4.0 kJ) from 1 g of carbohydrate (Table 5.1). Weight for weight, fat therefore contains 7-9 times more energy than alternative fuels, and thus provides the maximum energy storage for the minimum weight gain. Fat is an even more efficient fuel than high-octane vehicle fuel, and also has the advantage for birds that its oxidation yields an equal weight of water, thus contributing to another of the bird's needs during long-distance flights. Not only can fat be

Table 5.1 Energy and water yield of the three main fuel types in birds

Lipids in Protein in skeletal Glycogen adipose muscle or

Table 5.1 Energy and water yield of the three main fuel types in birds

Guide to Alternative Fuels

Guide to Alternative Fuels

Your Alternative Fuel Solution for Saving Money, Reducing Oil Dependency, and Helping the Planet. Ethanol is an alternative to gasoline. The use of ethanol has been demonstrated to reduce greenhouse emissions slightly as compared to gasoline. Through this ebook, you are going to learn what you will need to know why choosing an alternative fuel may benefit you and your future.

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