calories

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    • #6305
      Trishntonia
      Participant

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

      Please, Please, Please help!!!!

    • #59982
      honeev
      Keymaster

      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. ^_^

    • #60237
      MrMistery
      Participant

      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…

    • #60318
      nerdy*scientist
      Participant

      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.

    • #60334
      cracked_doc
      Participant

      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 …

    • #60916
      Trishntonia
      Participant

      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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