Obesity Rising Faster In Lower-Income Countries While Rich Nations See Slowdown, Study Finds

A major global study published in Nature has found that obesity rates are now rising much faster in low- and middle-income countries, while many high-income nations have started seeing obesity levels stabilize after decades of growth. Researchers say the findings reveal that the global obesity crisis is evolving differently across regions, age groups, and genders.

What happened

• Scientists analyzed obesity trends from 1980 to 2024 across 200 countries and territories
• The study used health data from 232 million people worldwide
• Researchers found obesity growth has slowed or plateaued in many rich nations
• Lower-income countries are now witnessing some of the fastest obesity increases globally

What the study found

In high-income countries

Many wealthy nations including:

• Western European countries
• North America
• Australasia
• Japan

have seen obesity rates level off after decades of growth.

Examples include:

• Adult obesity stabilizing between 11% and 23% in parts of Western Europe
• Lower obesity prevalence in Japan, especially among women
• Denmark becoming one of the earliest countries to show slowing obesity growth around 1990

Sharp rise in developing nations

By contrast, obesity rates are accelerating rapidly in several lower-income regions including:

• Central Europe
• Latin America
• Some middle-income economies

Countries such as:

• Romania
• Czechia
• Brazil

now report obesity prevalence reaching 30–40% among adults in some populations.

Differences by age and gender

Researchers also observed major differences across:

• Men and women
• Children and adults
• Individual countries and cultures

In many rich nations, obesity growth among children slowed earlier than among adults.

Why obesity is increasing globally

Scientists say obesity trends are influenced by:

• Food quality and availability
• Lifestyle changes
• Urbanization
• Physical inactivity
• Economic development
• Processed food consumption

The study suggests obesity cannot be treated as a single global pattern because the causes differ significantly between countries.

Why it matters

Obesity is strongly linked to major health conditions including:

• Diabetes
• Heart disease
• Stroke
• Cancer
• Liver disease

The findings may help governments design more targeted public health policies depending on regional conditions and population needs.

What changes

• Lower-income countries may face rising healthcare burdens
• Governments could introduce stronger nutrition and lifestyle policies
• Public health focus may increasingly shift toward childhood obesity prevention
• International health organizations may rethink global obesity strategies

Who is affected

• Adults and children worldwide
• Healthcare systems in developing nations
• Public health policymakers
• Nutrition and preventive medicine sectors

What to watch next

Researchers are expected to further study why obesity trends are slowing in some countries while accelerating in others, as governments worldwide search for more effective strategies to manage one of the fastest-growing global health challenges.