How many kilocalories would a meal containing 12g of protein, 4g of fat, and 42g of carbohydrates provide?

To determine the total number of kilocalories provided by a meal consisting of protein, fat, and carbohydrates, it's essential to know the caloric values of each macronutrient:

• Protein provides 4 kilocalories per gram.

• Fat provides 9 kilocalories per gram.

• Carbohydrates provide 4 kilocalories per gram.

Using this information, we can calculate the total kilocalories from each macronutrient in the meal.

First, calculate the calories from protein:

12 grams of protein × 4 kcal/g = 48 kcal

Next, calculate the calories from fat:

4 grams of fat × 9 kcal/g = 36 kcal

Then, calculate the calories from carbohydrates:

42 grams of carbohydrates × 4 kcal/g = 168 kcal

Now, add together all the kilocalories from the three macronutrients:

48 kcal (from protein) + 36 kcal (from fat) + 168 kcal (from carbohydrates) = 252 kcal

Thus, the meal containing 12g of protein, 4g of fat, and 42g of carbohydrates provides a total of 252 kilocalories. This is why the answer is correct.