Question

A goal is to get at least 10% of daily calories from polyunsaturated fats as are found in various nuts, oils, and fish. One serving of walnuts (about 15 pieces) has about 20 g of polyunsaturated fat. Each fat gram has 9 calories. About what percent of daily calories does one serving of walnuts provide, assuming a 2,000-calorie diet?

Answer 1

To get 10% of your calories from polyunsaturated fats you would need to eat 200 calories worth. So 1 serving of walnuts would give you 180 calories. So one serving of walnuts would be 9% of your daily calories.

Answer 2

The percent of daily calories does one serving of walnuts provide is 9%.

This question is solved using proportions.

We have:

• A diet of 2,000 calories.
• To find the percentage of daily calories provided by one walnut, we have to find the amount of calories in the walnut, and find it's percentage relative to 2,000.

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Walnut:

• Has 20 grams of polyunsaturated fat.
• Each gram has 9 calories.

Thus, the amount of calories of fat is:

$A = 20 \times 9 = 180$

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Percentage:

180 calories out of a daily diet of 2000 calories, so:

180*100%/2000 = 9%

The percent of daily calories does one serving of walnuts provide is 9%.

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