Q: Which equation correctly represents the calculation of Body Mass Index (BMI)?

BMI = $$\frac{\text{weight (kg)}}{\text{height (m)}^2}$$

Question 1

Which of the following is a major limitation of using Body Mass Index (BMI) as a tool for assessing health risk?

Accepted Answer

BMI does not account for muscle mass, potentially misclassifying muscular individuals as overweight or obese.

Question 2

According to the law of thermodynamics, which statement best describes energy balance in the human body?

Accepted Answer

Energy consumed must be equal to energy expended to maintain stable body weight.

Question 3

A person consumes 3,000 kcal per day but only expends 2,500 kcal. According to the concept of energy homeostasis, what is the likely outcome?

Accepted Answer

The person will gain weight due to a positive energy balance.

Question 4

Which hormone is primarily produced by adipose tissue and functions to inhibit food intake and increase energy expenditure?

Accepted Answer

Leptin

Question 5

What is the primary role of the hypothalamus in body weight regulation?

Accepted Answer

It integrates peripheral signals to regulate hunger and satiety.

Question 6

Which of the following best describes leptin resistance in obesity?

Accepted Answer

Leptin levels are elevated, but the appetite-suppressing effect is diminished due to reduced sensitivity of leptin receptors.

Question 7

Which equation correctly represents the calculation of Body Mass Index (BMI)?

Accepted Answer

BMI = $$\frac{	ext{weight (kg)}}{	ext{height (m)}^2}$$

Question 8

Which of the following factors is most modifiable and contributes significantly to total daily energy expenditure?

Accepted Answer

Physical activity

Question 9

Which gut hormone is known to stimulate food intake and activate AGRP/NPY neurons in the hypothalamus?

Accepted Answer

Ghrelin

Question 10

A patient has a high BMI but is a professional athlete with significant muscle mass. Which limitation of BMI does this scenario illustrate?

Accepted Answer

BMI does not account for muscle mass and may misclassify muscular individuals as overweight or obese.

Question 11

Which of the following is NOT a component of total daily energy expenditure?

Accepted Answer

Blood pressure regulation

Question 12

If an individual increases their protein intake, which aspect of energy expenditure is most affected?

Accepted Answer

Thermic effect of food (TEF)

Question 13

Which of the following best explains why leptin administration is not an effective treatment for common obesity?

Accepted Answer

Obese individuals often have leptin resistance, so additional leptin does not restore appetite regulation.

Question 14

Which of the following scenarios would most likely result in a negative energy balance?

Accepted Answer

An individual expends more energy than they consume.

Question 15

Which peripheral organ produces insulin, and what is its role in appetite regulation?

Accepted Answer

The pancreas produces insulin, which potentiates satiety and regulates glucose homeostasis.

Question 16

Which of the following is a short-term regulator of food intake that acts to stimulate hunger?

Accepted Answer

Ghrelin

Question 17

Which of the following factors does BMI NOT account for when assessing health risk?

Accepted Answer

Ethnicity

Question 18

Which neurons in the hypothalamus are activated in the fed state and help suppress appetite?

Accepted Answer

POMC neurons

Question 19

A person is experiencing weight gain despite normal caloric intake. Which of the following could be a contributing factor based on the complexity of body weight regulation?

Accepted Answer

Reduced physical activity leading to lower energy expenditure

Question 20

Which of the following best describes the role of leptin as an 'adipostat'?

Accepted Answer

Leptin modulates appetite and energy expenditure to maintain stable adipose tissue stores.

Biological Aspects of Obesity: Energy Balance, Regulation, and Hormonal Control

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