What percentage of total kilocalorie intake is comprised of carbohydrates for a 165lb (75kg) athlete with a daily intake of 450g carbs, 75g protein, and 100g fat?

To determine the percentage of total kilocalorie intake that comes from carbohydrates, it is necessary to first calculate the total caloric intake from each macronutrient: carbohydrates, protein, and fat, and then find the overall percentage that carbohydrates contribute.

Carbohydrates provide 4 kilocalories per gram, protein also provides 4 kilocalories per gram, and fat provides 9 kilocalories per gram.

1. Calculate calories from carbohydrates:

• 450 grams of carbohydrates × 4 kcal/g = 1800 kcal

2. Calculate calories from protein:

• 75 grams of protein × 4 kcal/g = 300 kcal

3. Calculate calories from fat:

• 100 grams of fat × 9 kcal/g = 900 kcal

4. Total caloric intake:

• Add the calories from all macronutrients:

• 1800 kcal (carbs) + 300 kcal (protein) + 900 kcal (fat) = 3000 kcal

5. Calculate the percentage of total calories from carbohydrates:

• (Calories from carbohydrates ÷ Total caloric intake) × 100

• (1800 kcal