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A new international study reveals a strong connection between consuming meals prepared outside the home and weight gain, contributing significantly to the global obesity problem.
The research indicates that restaurants, fast-food outlets, takeout, and other commercially prepared foods might be playing a bigger role in worldwide obesity than previously recognized.
Presented at the European Congress on Obesity (ECO 2026) in Istanbul, Turkey, the study was led by scientists from Göttingen University and Heidelberg University in Germany.
Analyzing data from 65 countries and involving over 280,000 adults between 2009 and 2021, the researchers aimed to understand how frequently people eat food outside the home and the impact on their body weight.
For years, scientists have warned about the rapid increase of obesity globally, now considered a major public health concern due to its link to heart disease, diabetes, high blood pressure, strokes, cancer, joint problems, and other health issues.
While poor diets and inactivity are well-understood contributors, this study highlights the growing importance of eating meals prepared outside the home.
Foods purchased from restaurants and fast food tend to have larger portions, more calories, and higher levels of salt, sugar, and unhealthy fats compared to home-cooked meals. Many commercially prepared foods are heavily processed, which can lead to overeating without realizing it.
Previous research has shown a link between dining out and obesity in wealthy nations like the U.S. and parts of Europe, but little was known about lower-income countries where lifestyles and food systems are rapidly evolving.
To address this gap, the team analyzed large-scale national health surveys from countries across income levels. Participants reported how many meals they ate outside the home each week, including breakfast, lunch, and dinner.
Findings revealed that nearly half of adults worldwide eat at least one meal prepared outside their homes weekly. Meal habits, however, vary considerably across regions.
In the Americas, approximately 81% of adults reported eating out weekly. In Southeast Asia, this figure drops to around 26%. In Central Europe, about 36% of adults regularly dine on outside food.
Unsurprisingly, wealthier nations see higher frequencies of eating out. Adults in high-income countries consume more than three times the number of outside meals compared to those in low-income countries.
A crucial discovery was that individuals in lower-income nations who are overweight or obese are significantly more likely to dine out frequently. For example, in low-income countries, adults with obesity have a 39% higher rate of eating outside the home than those with normal weight. In lower-middle-income nations, this figure is about 20%.
This trend might reflect what scientists call a “nutrition transition” — as countries grow wealthier and urbanized, fast food and processed meals become more accessible and affordable, gradually replacing traditional home cooking.
The study also identified social patterns linked to eating outside the home. Men tend to dine out more often than women. Younger adults are more likely to eat outside than older individuals. Unmarried, employed, and highly educated people also report higher outside meal consumption.
Researchers suggest that in poorer countries, eating out can symbolize social status and wealth, whereas in richer nations, it’s become a routine part of daily life.
These findings imply that efforts to prevent obesity need to look beyond individual choices made at home. Public health strategies should also address the food environment, including restaurants and takeaway options.
Professor Sebastian Vollmer, a senior researcher involved in the study, explains that modern food environments—large portions, processed foods, sugary drinks, aggressive marketing—make it difficult for people to avoid overeating.
He advocates for stronger government policies to improve the nutritional quality of outside foods. Possible measures include clearer labeling, healthier menu options, smaller portion sizes, and restrictions on unhealthy food advertising.
However, the study has limitations. Since it’s based on observed eating patterns, it cannot definitively prove that eating out causes obesity. Other factors like physical activity, overall calorie intake, and lifestyle habits also influence body weight.
Additionally, the data relies on participants’ self-reported habits, which may be inaccurate. The surveys count how many meals are eaten outside but don’t assess the nutritional quality of those meals.
Despite these constraints, the evidence strongly links outside dining with increased obesity rates worldwide. The findings suggest that the obesity epidemic isn’t solely about individual willpower but also about the modern food environment that makes healthy choices more challenging.
As dining out becomes increasingly common worldwide, finding ways to make outside foods healthier could be a crucial step in addressing obesity.
For those interested in health, recent studies explore the best times to take vitamins to prevent heart disease and how vitamin D supplements can significantly reduce cancer mortality. Other research highlights plant nutrients that may help lower high blood pressure and antioxidants that could decrease dementia risk.
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