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    You are in: Home / Community Forums / Cooking Q & A / Another calorie question
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    Another calorie question

    najwa
    Thu Dec 20, 2001 11:48 am
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    Several sites say that a raw potato with skin is 120-130 calories, but, after baking or boiling, it jumps up to 200 or more (w/ skin)!! now this just doesnt make sense .. any ideas?
    Tara
    Thu Dec 20, 2001 12:55 pm
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    I have never heard that before, I thought cooked potatoes were the same. You would think since lots of starch comes out when cooking in water they would actually be better.
    Steve_G
    Thu Dec 20, 2001 1:09 pm
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    Najwa,

    I looked around a bit as your question really interested me. You're right on. According to the USAD database a raw potato runs 150 cals or so and baked it's 220 -- 31% higher!.

    I'm guessing that the reason is the way they derive their nutrient values and water content.

    They do it in large lots with several varieties get their figures on a per 100 gram basis and then find the average weight and size of a potato and do a bit of math.

    Looks to me like some tech at the USDA dropped the ball and used the weight of the raw potato for all his calculations.

    Since the water content of a raw potato is greater than that of a cooked one you need to do the analysis on a weight basis

    100 gms of raw = 79 cals
    100 gms of boiled = 87 cals
    100 gms of baked = 93 cals

    that's still a 10% to 15% difference, but since the raw potato has more water in it then you get a bit closer, less than 10% in the case of the boiled -- still a bit too much deviation for my tastes, but not un-reasonable considering the test subject.
    najwa
    Fri Dec 21, 2001 9:09 am
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    that didn't occur to me .. but one site i was at was doing it by size, 3" by something, and it was still different ..
    But what you say does make sense .. in that case, when you boil one potato, then the calories don't inrease, and you still get as much as you would from a raw one ..
    Thanks icon_smile.gif
    Steve_G
    Fri Dec 21, 2001 12:17 pm
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    Najwa,

    I think it goes back to one of the basic laws of phyics -- mass can't be created or destroyed -- so, with some slight variations I think you're pretty safe to assume that you're getting around 80 cals per 100 gm of potato that you consume.
    Dib's
    Fri Dec 21, 2001 12:22 pm
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    It's a sugar thing. Baked, you lose water content and the potato becomes "concentrated"
    Boil it and you keep water content even though the heat "activates" sugars. = calories Di
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