Typical foods produce 9 cal/g for their fat content and 4 cal/g for their protein and carbohydrate content. if a typical apple weighs 225 g and is 84% water, 14% carbohydrate, and 0.5% fat, how many calories of food energy does an apple provide?

Explanation:

We know that

So, to find the answer, we need to know the number of grams that is fat and carbohydrate.

Using the given percentages, we have

Fat:

Carbohydrate:

An apple has 1.125 grams of fat and 31.5 grams of carbohydrates.

If there are 9 calories per gram of fat, the total number of calories in this case would be

Fat:

If there are 4 calories per gram of carbohydrate, the total number is

Carbohydrate:

Therefore, an apple provides 10.125 calories from fat and 126 calories from carbohydrates, for a total of 136.125 calories.

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