Japan: The Discipline of Moderation
Japan continues to post some of the lowest obesity figures among wealthy nations, and diet is widely credited as the main reason. With obesity rates below 5% compared to over 30% in the US, Japan avoids many weight related health issues. The national eating pattern leans heavily on fish, soy, seaweed, and rice rather than red meat or heavily processed snacks.
Researchers who study the country’s longevity point to specific dietary habits rather than any single miracle ingredient. A low intake of red meat, milk, dairy products, sugar, and sweeteners is associated with low mortality rates from cancer and ischemic heart disease, as well as a low prevalence of obesity, with avoiding obesity appearing to be a key factor in maintaining good health. Regional habits, like the famously moderate eating style practiced in Okinawa, reinforce the same pattern nationwide.
Taiwan: A Modern Diet Built on Old Habits
Taiwan has climbed to the very top of several global health rankings in recent years, and its food culture is a big part of that story. Topping the CEOWorld Global Health Index 2025 with a score of 97.59, Taiwan has earned its place as the world’s healthiest country through a combination of an exceptionally efficient healthcare system, a nutritious national diet, and strong government investment in public health. The everyday diet favors freshness and variety over convenience.
What nutrition researchers now call the Taiwanese Eating Approach has become a shorthand for this pattern. Taiwan’s dietary pattern is a key driver of its top ranking, built around a diet rich in plant based foods, aquatic foods, soy products, and green tea, with minimal fast food. Lawmakers have leaned into this strength rather than taking it for granted, formally codifying healthy eating as a policy goal.
Spain: Olive Oil, Legumes, and Long Lunches
Spain has repeatedly landed near the very top of international health rankings, and the Mediterranean diet is almost always cited as the reason why. In 2019, Bloomberg compiled their most recent edition of their Healthiest Country Index, placing Spain at the top, with two other Mediterranean countries, Italy and Israel, sitting in the top ten. Olive oil, fresh vegetables, legumes, and fish form the backbone of most meals.
What sets the Spanish approach apart isn’t just the ingredients but how sparingly certain foods appear at all. Italy and Spain stand out for their Mediterranean diet enriched with legumes, vegetables, olive oil, and very little processed foods. Social rituals around eating, like slower, shared meals, tend to reinforce these habits rather than undercut them.
South Korea: Fermentation and Firm Policy
South Korea’s food culture, built around kimchi, vegetables, and moderate portions of grilled protein, has long been associated with lower rates of chronic disease. What has changed more recently is the government’s willingness to legislate around diet rather than simply hope tradition holds. South Korea has made serious policy changes, and now taxes sugary drinks and requires clear nutrition labels.
These interventions matter because South Korea, like much of Asia, has faced growing pressure from Western style fast food and packaged snacks. Fermented staples such as kimchi and soybean paste remain daily fixtures in most households, providing fiber and probiotics that are largely absent from more processed diets. The combination of a still intact traditional diet and active regulation has kept the country’s health outcomes comparatively strong.
Israel: Regulation Meets Mediterranean Roots
Israel’s diet borrows heavily from Mediterranean traditions, and the country has consistently posted some of the lowest diet related mortality figures in the world. Israel had the lowest rate of diet related deaths, at 89 per 100,000 people, followed by France, Spain and Japan. Vegetables, legumes, olive oil, and fish dominate everyday meals in a pattern that closely mirrors its Mediterranean neighbors.
Israel has also taken an unusually direct approach to protecting children’s eating habits through regulation. Israel bans junk food ads during children’s TV. That combination, a diet with strong traditional roots plus active government intervention, has helped the country stay near the top of most health comparisons rather than drifting toward the patterns seen elsewhere in wealthier nations.
The United States: Ultra Processed by Default
The United States sits at the opposite end of nearly every major dietary health comparison, and the numbers are stark. The United States has the unhealthiest diet globally, based on the highest intake of added sugar, ultra processed foods, and sodium, with Americans consuming an average of 17 teaspoons of added sugar daily, nearly triple the WHO limit, and over 60% of their food supply coming from ultra processed items. That is a structural issue, not just a matter of individual willpower.
The health consequences of this pattern are measurable and severe. One in three American adults has prediabetes, and one in two has high blood pressure. More than 700,000 Americans die each year from conditions tied to poor nutrition, including heart disease, type 2 diabetes, stroke, and certain cancers.
Mexico: A Soda Habit With Steep Costs
Mexico’s traditional diet, built around corn, beans, and fresh produce, has been steadily displaced by sugary drinks and packaged snacks over the past few decades. Mexico has the highest rate of type 2 diabetes in the world, largely due to a dramatic shift from traditional corn based meals to sugary soda and processed snacks, with Mexicans consuming more soda per capita than any other country, at an average of 720 liters per person annually. That is an extraordinary volume of sugar moving through a single population every year.
The scale of the shift shows up clearly in childhood health statistics as well. Mexico ranks second in diet related deaths, with sugary drinks being the biggest culprit, and over 90% of Mexicans drink soda daily, while the country has the highest rate of childhood obesity in Latin America. Public health officials have introduced soda taxes in response, though the habit remains deeply entrenched.
Nauru: The Weight of Imported Food
Nauru, a tiny Pacific island nation, currently posts one of the highest obesity rates ever recorded anywhere in the world. Nauru has the highest obesity rate among adults, at 70.7%. The island’s remoteness and limited farmland mean that almost all food arrives by ship, and cheap, calorie dense imports have largely replaced what was once a fish and vegetable based diet.
The health consequences extend well beyond body weight alone. Type 2 diabetes prevalence among adults exceeds 15 to 20% in many Pacific nations, rising to as much as 31% in Nauru, and up to 45% among those aged 55 to 64. Government efforts to tax sugary imports have had limited success against decades of dietary change.
Kiribati: When Healthy Food Costs More
Kiribati faces a version of the same problem seen across much of the Pacific, but with an added twist involving price. Leading the world in the percentage of population inflicted with diabetes, Kiribati has earned its spot as one of the unhealthiest countries in the world, with a diabetes rate of over 30% and an obesity rate of over 50%. These are staggering figures for a population of roughly 130,000 people.
What makes the situation particularly frustrating is that traditional food, when available, is genuinely healthy. While the traditional foods in Kiribati are relatively healthy, consisting mainly of fruits and leafy greens, processed foods in Kiribati are cheaper than anywhere else in the world, and eating healthy becomes much more of a struggle when a bag of apples costs double a bag of potato chips. Economics, more than preference, is driving the outcome.
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