Q: Which equation best represents the calculation of the percentage of total energy intake from carbohydrates?

$$\text{Carbohydrate Energy} \div \text{Total Energy Intake} \times 100$$

Q: If a diet provides 250 grams of carbohydrates and the total energy intake is 2000 kcal, what percentage of energy comes from carbohydrates? (Assume 1 gram carbohydrate = 4 kcal)

$$\frac{250 \times 4}{2000} \times 100 = 50\%$$

Question 1

According to dietary recommendations, what percentage of total daily energy intake should carbohydrates make up for adults?

Accepted Answer

$$45\% - 65\%$$

Question 2

Which of the following is NOT a reason that carbohydrates are needed in the diet?

Accepted Answer

Carbohydrates are the only macronutrient that can be stored as fat.

Question 3

During moderate to intense exercise, which macronutrient is primarily used for energy?

Accepted Answer

Carbohydrates

Question 4

Which process describes the body's production of ketone bodies due to insufficient carbohydrate intake?

Accepted Answer

Ketogenesis

Question 5

A patient presents with fatigue, inability to concentrate, and shortness of breath after starting a low-carb diet. What is the most likely cause?

Accepted Answer

Ketosis/Ketacidosis

Question 6

Which of the following tissues/organs relies exclusively on glucose to function?

Accepted Answer

Red blood cells

Question 7

Which statement best explains why carbohydrates spare proteins from being used as energy?

Accepted Answer

Carbohydrates provide enough energy so proteins can be used for growth and repair.

Question 8

Which of the following statements about the body's use of glucose is correct?

Accepted Answer

Glucose is required by red blood cells for energy.

Question 9

What is the primary reason that the body increases fat oxidation during light exercise compared to carbohydrate oxidation?

Accepted Answer

The body prefers to conserve carbohydrates for higher intensity activities.

Question 10

Which equation best represents the calculation of the percentage of total energy intake from carbohydrates?

Accepted Answer

$$	ext{Carbohydrate Energy} \div 	ext{Total Energy Intake} 	imes 100$$

Question 11

Which of the following is a potential consequence of excessive ketone production due to low carbohydrate intake?

Accepted Answer

Ketacidosis, which can lead to coma or death

Question 12

Why is glucose considered the most important and biologically relevant carbohydrate?

Accepted Answer

It is the only carbohydrate in metabolism & energy production for nearly all life, including humans.

Question 13

Which process allows the body to produce glucose from non-carbohydrate sources when blood glucose is low?

Accepted Answer

Gluconeogenesis

Question 14

A person is performing intense exercise. Which macronutrient will their body primarily use for energy?

Accepted Answer

Carbohydrates

Question 15

Which of the following is a physiological effect of ketosis?

Accepted Answer

Accumulation of ketone bodies in the blood

Question 16

If a diet provides 250 grams of carbohydrates and the total energy intake is 2000 kcal, what percentage of energy comes from carbohydrates? (Assume 1 gram carbohydrate = 4 kcal)

Accepted Answer

$$\frac{250 	imes 4}{2000} 	imes 100 = 50\%$$

Question 17

Which of the following statements about carbohydrate metabolism is FALSE?

Accepted Answer

Carbohydrates are not necessary for red blood cell function.

Question 18

Which scenario best illustrates the concept of 'protein sparing' by carbohydrates?

Accepted Answer

A person on a high-carb diet uses protein for muscle growth rather than energy.

Question 19

Which of the following is most likely to occur if carbohydrate intake is chronically low?

Accepted Answer

Increased ketone body production

Carbohydrates: Plant-Derived Energy Nutrients – Why Do We Need Carbohydrates?

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