One slice of bread contains 18 g carbohydrates, 4 g protein, and 1.5 g fat. approximately how many kcal are in one slice

To find out the energy available from a food, work it out by multiplying  the number of grams of carbohydrate by 4kcal/g, protein by 4 kcal/g, and fat by 9kcal/g. Then get the sum of the results.

So we have,

18g carbohydrate x 4 kcal/g    =      72 kcal
4g protein x 4 kcal/g                 =      16 kcal
1.5g fat x 9kcal/g                       =      13.5 kcal
Total                                            = 101.5 kcal

Therefore, one slice of bread contains 101.5 kcal.

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