Archive · 25 Jul 2025
Study: High-Calorie Diets, Not Inactivity, Drive Global Obesity
Imagine everyone is getting bigger.
Some people thought it was because they weren't moving around as much.
But a new study looked at how much energy people use and found something different.
The study looked at people all over the world, and it turns out that people in richer places, where people eat more, actually use just as much energy, or even more, than people in poorer places.
This means that the main reason people are getting bigger is not because they are sitting around more, but because they are eating more.
So, it's important to eat healthy and stay active to stay in shape.
Study suggests high-calorie diets, not reduced physical activity, drive global obesity.
Researchers analyzed energy expenditure and body metrics of over 4,200 adults across six continents.
Findings show people in wealthier countries expend similar or more energy than those in less developed areas.
Dietary changes are a primary factor in the increase of body fat with economic development.
Researchers emphasize both diet and exercise should be prioritized to combat obesity.
- Who
- Researchers from Duke University led the study.
- What
- Study suggests high-calorie diets as primary cause of global obesity.
- When
- The study was recently published in the journal PNAS.
- Where
- The study involved adults across 34 populations on six continents.
- Why
- To understand the primary drivers of rising obesity rates.
Traditional View
Study Findings
Primary cause of Obesity
Traditional View
Decline in physical activity is the main driver of rising obesity rates.
Study Findings
High-calorie diets are the primary driver of global obesity.
- Lead Researchers
- Herman Pontzer and Amanda McGrosky
- Participants
- Over 4,200 adults
- Study Focus
- Energy expenditure, BMI, and body fat percentage
- Key Finding
- High-calorie diets are the primary cause of obesity
- Study Journal
- PNAS