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Remember these three:

1 gram of Fat = 9 calories.

1 gram of Carbs = 4 calories

1 gram of protein = 4 calories

To get the percent of fat in potato chips you would need to figure out the fat gram, carb gram and protein gram.

Example: There are 10g of fat, 15 g of carbs, and 2 g of protein in a one serving bag of potato chips. So multiply

Fat: 10 g x 9 = 90 calories

carbohydrate: 15 g x 4 = 60

Protein: 2 g x 4 = 8

Add 90+60+8= 158 Total Calories in one serving bag of potato chips

Divide 90 calories of fat into 158 total calories (90/158 = 0.57 x 100 = 57%)

There are 57% fat in one serving bag of potato chips.

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Q: Scientifically how do you measure fat percentage in food?
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