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calories

Discussion of all aspects of biological molecules, biochemical processes and laboratory procedures in the field.

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calories

Postby Trishntonia » Tue Nov 14, 2006 12:29 am

Why does fat have twice as many calories as carbohydrates and protein?

Please, Please, Please help!!!!
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fat has twice as much calories

Postby honeev » Tue Nov 14, 2006 12:38 am

its because fat has (more than) twice as many calories as the same weight of carbs or protein. That is, 1 gram of fat provides 9 calories, whereas 1 gram of both carbohydrates and protein provide 4 grams each. ^_^
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World only have two things: Things you can eat and things you no can eat."

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Postby MrMistery » Tue Nov 14, 2006 9:41 am

t's because fatty acids contain a lot of acetyl groups that can be transfered to the krebs cycle, leading to many protons being pumped by the electron transport chain, and as a result a lot more ATP is formed...
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Postby nerdy*scientist » Wed Nov 15, 2006 8:01 am

Everything is right - fatty acids store more energy in their chemical bonds than carbs and protein, which leads to more energy production when they are broken down (by the cell this makes ATP). A calorie is just a measure of heat energy, and since the chemical bonds in fats contain more energy fat is more calories.
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Postby cracked_doc » Wed Nov 15, 2006 1:29 pm

lipids store double the amount of energy as compared to carbohydrates or proteins because the have a high ratio of C-H bonds in them... as C-H bonds store alot of energy thus they have more calories ...
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Postby Trishntonia » Thu Nov 23, 2006 2:47 am

thanks soooo much for all your answers!!! They were all right! The question has been extra credit in Bio for about 2 months now, and when I finally get the answer, another person got it too :( That sucks! He beat me by like 3 days. But thanks again!
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