Using the energy values for foods (see TABLE3.7), determine each of the following (round off the answer for each food type to the tens place):d. the grams of fat in one avocado that has 405 kcal, 13 g of carbohydrate, and 5 g of protein

Verified step by step guidance

1. Identify the energy contribution of carbohydrates and proteins using their respective caloric values: carbohydrates provide 4 kcal/g and proteins provide 4 kcal/g.
2. Calculate the total energy provided by carbohydrates: multiply the grams of carbohydrates (13 g) by 4 kcal/g.
3. Calculate the total energy provided by proteins: multiply the grams of proteins (5 g) by 4 kcal/g.
4. Add the energy contributions from carbohydrates and proteins to find the total energy from these macronutrients.
5. Subtract the total energy from carbohydrates and proteins from the total energy of the avocado (405 kcal) to find the energy contribution from fats. Then, divide this energy by the caloric value of fats (9 kcal/g) to find the grams of fat.

Key Concepts

Caloric Content of Macronutrients

Each macronutrient contributes a specific number of calories per gram: carbohydrates provide 4 kcal/g, proteins also provide 4 kcal/g, and fats provide 9 kcal/g. Understanding these values is essential for calculating the total caloric contribution of each macronutrient in a food item, which is crucial for determining the grams of fat in the avocado.

Energy Balance Equation

The energy balance equation states that the total energy content of a food item is the sum of the energy contributions from carbohydrates, proteins, and fats. By rearranging this equation, one can isolate the grams of fat by subtracting the energy contributions from carbohydrates and proteins from the total energy content, allowing for the calculation of fat content.

Rounding Numbers

Rounding is a mathematical process used to simplify numbers to a specified degree of accuracy. In this context, rounding the calculated grams of fat to the nearest ten is necessary for clarity and ease of communication, especially when presenting nutritional information. Understanding how to round correctly ensures that the final answer is both accurate and appropriately formatted.