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Why do cooked potatoes weigh less than raw ones?

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Wee Kaz | 13:59 Wed 08th Jan 2003 | How it Works
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I am currently on the weight watchers diet which involves weighing your food so you can calculate the 'points value' Can someone tell me why when I weighed a raw potato and it was just under 400g although once it was cooked it was just over 300g? Does anyone know why it decreases in weight and should I take it as 300g?
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I'd guess the water content evaporates during cooking.
boiled or baked?

if baked then it's down to water loss
Peeling? :-)
I don't know about why a potato weight less, but if you're doing the weight watchers thing, I wouldn't worry overly much about it. Just use your common sense. If it's a medium sized baked potato it will be 2 1/2 points, if it's large 4 points. The weights they give you are more of a guide when it comes to something like this. I think the idea of it is to get you into good eating habits. Anyway, this is how I've been doing it, and I've lost 2 1/2 stone. Good Luck, I hope it works for you.

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Why do cooked potatoes weigh less than raw ones?

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