Q: Which equation best represents the energy balance model related to obesity?

$$\text{Change in body fat} = \text{Energy intake} - \text{Energy expenditure}$$

Q: If the price of 100 kcal of cola fell from $$0.13 to 0.09 $$between 1990 and 2007, what is the percentage reduction?

$$\frac{0.13 - 0.09}{0.13} \times 100 = 30.77\% ($$but the study reports 35\%, so rounding and context matter)

Question 1

Which of the following best describes the direct biological cause of obesity?

Accepted Answer

Reduced physical activity and increased caloric intake, leading to energy intake exceeding energy expenditure.

Question 2

According to economic studies, which factor has shown only a small or negligible effect on obesity rates when controlling for other variables?

Accepted Answer

Relative prices of fast food.

Question 3

If a person's daily caloric intake is 2,500 kcal and their daily energy expenditure is 2,000 kcal, what is the expected outcome over time?

Accepted Answer

The person will gain weight due to a positive energy balance: $$2,500 - 2,000 = 500$$ kcal surplus per day.

Question 4

Which underlying economic factor has contributed to changes in food consumption patterns in the US over recent decades?

Accepted Answer

Technological advances in food production and preparation.

Question 5

Which trend is most closely associated with increased consumption of ultra-processed foods?

Accepted Answer

Higher prevalence among households with lower education and income levels.

Question 6

Which of the following is a modifiable component of energy expenditure?

Accepted Answer

Physical activity, such as exercise and walking.

Question 7

A county has the highest number of fast food restaurants per capita. What is a likely outcome according to associational studies, after controlling for income and education?

Accepted Answer

No significant correlation between fast food access and obesity rates.

Question 8

Which equation best represents the energy balance model related to obesity?

Accepted Answer

$$	ext{Change in body fat} = 	ext{Energy intake} - 	ext{Energy expenditure}$$

Question 9

Which of the following statements about trends in US adult physical activity is supported by the data?

Accepted Answer

There has been little change in overall leisure activity, but some changes in composition (e.g., more TV watching, less sleep).

Question 10

Which of the following is NOT considered an underlying economic cause of rising obesity?

Accepted Answer

Increased manual labor in the workforce.

Question 11

If the price of 100 kcal of cola fell from $$0.13 to 0.09 $$between 1990 and 2007, what is the percentage reduction?

Accepted Answer

$$\frac{0.13 - 0.09}{0.13} 	imes 100 = 30.77\% ($$but the study reports 35\%, so rounding and context matter)

Question 12

Which of the following best explains why the prevalence of obesity varies by education level?

Accepted Answer

Individuals with lower education levels may have less access to health information and resources, leading to higher obesity rates.

Question 13

Which of the following is a key insight from economic analysis of obesity trends?

Accepted Answer

There is no single dominant economic cause; multiple factors each contribute a small amount.

Question 14

Which scenario best illustrates the impact of technological change on food consumption?

Accepted Answer

The introduction of automated pizza ovens reduces the time needed to prepare meals, increasing the likelihood of eating prepared foods.

Question 15

Which of the following is an example of an ultra-processed food?

Accepted Answer

Sugar-sweetened beverages.

Question 16

If a population's share of energy intake from ultra-processed foods rises from 30% to 50% over 20 years, what is the percentage increase?

Accepted Answer

$$\frac{50 - 30}{30} 	imes 100 = 66.67\%$$

Question 17

Which of the following best describes the relationship between food consumed away from home and American food budgets?

Accepted Answer

Food consumed away from home now accounts for about 60% of American food budgets.

Question 18

Which of the following is a plausible reason why consumption of ultra-processed foods is higher in lower income households?

Accepted Answer

Ultra-processed foods are often cheaper and more accessible than fresh foods.

Question 19

Which of the following statements is supported by the data on US obesity trends from 1999/2000 to 2021/2023?

Accepted Answer

The prevalence of obesity has continued to rise over time.

Economic Aspects and Causes of Obesity: A Personal Health Perspective

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