Is RFK Jr right about China's diabetes rate?

Summary

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More or Less – Is RFK Jr Right About China's Diabetes Rate?

Podcast: More or Less
Host: Tim Harford, BBC Radio 4
Guest: Professor Diana Magliano
Episode Date: November 8, 2025

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Episode Overview

This episode investigates recent claims by US Health Secretary Robert F. Kennedy Jr. about the prevalence of diabetes in China and among American children. Host Tim Harford, with input from diabetes epidemiologist Professor Diana Magliano, fact-checks RFK Jr.'s numbers, reviews global diabetes statistics, and discusses trends in diabetes diagnoses worldwide.

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Key Discussion Points and Insights

1. RFK Jr.’s Claim Under the Microscope

• RFK Jr.’s Assertions ([01:44] & [04:51]):

  • Claimed a dramatic rise in juvenile diabetes: From a rare condition for pediatricians to 1 in 3 kids currently being prediabetic or diabetic in the US.
  • Stated, “Twenty years ago there was no diabetes in China. Today, 50% of the population is diabetic.”

• Immediate Reaction

  • Tim Harford: “[RFK Jr.'s] 50% figure can't possibly be right,” ([04:57]).
  • Calculations show if China’s rate were 50%, global diabetes figures would be mathematically impossible.

2. Explaining Diabetes and Its Types

• Professor Diana Magliano ([02:41]):
  • Differentiates Type 1 (autoimmune, insulin absent) and Type 2 (insulin resistance, lifestyle-related) diabetes.
  • “If you don't have insulin, you will die.” ([03:00])
  • 90% of global diabetes cases are Type 2 ([03:22]).

3. Risk Factors and Genetic Predisposition

• Obesity is a major driver, but not the sole factor ([03:47]).
• Certain populations, especially those from Asia, India, Pakistan, and indigenous groups, have higher genetic risk ([04:01]).

4. The Real Numbers: China and Global Context

• Current Diabetes Prevalence in China

  • Professor Magliano: “No, it's at about 12%.” ([05:21])
  • 2000: Less than 1% Chinese adults with diabetes.
  • Latest figures: 11.9% of adults aged 20–79 are diabetic ([05:52]).
  • Rise is significant, but not remotely close to 50%.
  • Urbanization and lifestyle change are major contributors.

• Global Perspective

  • 590 million people worldwide with diabetes—“likely an underestimate” ([04:18]).
  • Highest prevalence: Pakistan (~30–31%), some Pacific islands even higher ([06:27]).
  • Example: Nauru’s diabetes prevalence reached 34% overall, and 50% in some older groups after rapid socio-economic changes ([06:46]).

5. Trends in Prevalence and Incidence

• In middle- and low-income countries, the burden is growing due to genetic and lifestyle factors ([07:24]).
• In high-income countries, new cases are stabilizing, but the overall prevalence is up because patients are living longer ([07:57]):
  • “Prevalence is generally rising everywhere because we're living longer with diabetes, because we're managing it so much better.” – Prof. Magliano

6. Diabetes in Children and Adolescents

• RFK Jr.'s American Child Statistic
  • Tim Harford: 1 in 3 American children aged 12–17 are prediabetic—CDC data ([08:40]).
  • But: 70% of prediabetic teens will not develop diabetes ([08:40]).
• Actual pediatric Type 2 diabetes rate:
  • Professor Magliano: “It's really low. For type 2, it's 0.67 in 1000,” or 1 in 1,500 children under 20 ([09:14]).
• Observation: Diagnoses occurring younger in high-income Asian countries (Japan, Korea), less so in white European populations ([08:21]).

7. Signs of Hope

• “We can be cautiously optimistic that in at least high income countries we’re managing to turn the tide.” ([09:36])
• Increased awareness and better management are helping contain—or even reduce—new Type 2 diabetes cases, even if overall prevalence keeps rising as people live longer.

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Notable Quotes and Memorable Moments

• On RFK Jr.'s China claim:
  • Tim Harford ([04:57]): “That would mean 700 million people in China have diabetes and … the rest of the world has negative 100 million diabetics. Now, I'm not a doctor, but that doesn't seem very likely.”
  • Prof. Magliano ([05:21]): “No, it's at about 12%.”
• Historical change in China:
  • Prof. Magliano ([05:52]): “In 2000, it was under 1% of people in China would have diabetes. And now … 11.9% of Chinese adults aged 20 to 79 have diabetes.”
• On the alarming pace in Nauru:
  • Prof. Magliano ([06:46]): “So their diabetes prevalence hit 34% overall and it was 50% in some of the older age groups.”
• On trends:
  • Tim Harford ([07:40]): “Although the percentage of people who have diabetes is growing, the rate of new cases is stabilising and in some places reducing.”
• Re: US children’s actual numbers:
  • Prof. Magliano ([09:14]): “It's really low. For type 2, it's 0.67 in 1000.”
• On progress:
  • Prof. Magliano ([09:36]): “We can be cautiously optimistic that in at least high income countries we’re managing to turn the tide.”

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Key Timestamps

• RFK Jr’s claim and host’s response: [01:44] – [04:57]
• Explanation of diabetes types: [02:41] – [03:22]
• Population risk factors: [03:47] – [04:18]
• World diabetes statistics and China fact-check: [04:18] – [06:07]
• Highest global diabetes rates: [06:27]
• Case Study: Nauru: [06:46]
• National and regional trends: [07:24] – [07:57]
• Children and prediabetes in the US: [08:35] – [09:18]
• Hopeful note on managing diabetes: [09:36]

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Summary

Tim Harford and Professor Diana Magliano rigorously debunk RFK Jr.'s claim that half of China’s population is diabetic—it's actually around 12%, a steep rise from 1% in 2000, but dramatically lower than stated. While the global number of people with diabetes is unprecedented, most cases are Type 2 and country prevalence varies widely. In the US, while 1 in 3 teenagers are prediabetic, only a fraction will develop diabetes, and actual pediatric Type 2 rates are much lower than suggested. Globally, high-income countries are stabilising new cases through better management and awareness, offering some hope for the future.

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Transcript

[Tim Harford]

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[Professor Diana Magliano]

First.

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[Tim Harford]

Hello, thanks for downloading the More or less podcast. We're the program that looks at the numbers that emerge in the news, in life and from the mouths of U.S. politicians. And I'm Tim Harford. The U.S. health Secretary, Robert F. Kennedy Jr. Is on a mission to make America healthy again, along with firing all 17 members of the Advisory Committee for Immunisation Practices and cancelling a campaign to encourage people to be vaccinated against flu. One of his health promotion ideas is to reduce chronic illness, specifically diabetes.

[Ad Voice 3]

He claimed that juvenile diabetes A typical pediatrician would see one case of diabetes in his lifetime over a 40 or 50 year career. Today, one out of every three kids who walks through his office door is pre diabetic or diabetic. Twenty years ago there was no diabetes in China. Today, 50% of the population is diabetic.

[Tim Harford]

Are his numbers right? And how much of a problem is diabetes in the US and around the globe? Our guide to all things diabetic is Professor Diana Magliano. She's a diabetes epidemiologist who works at the Baker Heart and Diabetes Institute in Melbourne and Monash University in Australia. She has also co authored two editions of the Diabetes Atlas. First things first. What is diabetes? As you may or may not know, there are two main types.

[Professor Diana Magliano]

The first type is type 1 diabetes and that occurs from an autoimmune process against your pancreatic system cells and no longer produce any insulin.

[Tim Harford]

Insulin is a hormone that allows us to absorb glucose from food for our body to use to power itself within.

[Professor Diana Magliano]

Days or sometimes even up to two weeks. If you don't have insulin, you will die. So that's the one that people get mainly in childhood, but we also see that now in young adults and older adults. And type 2 diabetes is a bit different in the sense that the biggest feature is insulin resistance. They're resistant to their insulin and they need more and more to do the same job.

[Tim Harford]

It's type 2 diabetes that generally hits the headlines as it makes up about 90% of all diabetes cases.

[Professor Diana Magliano]

It's a disease in older people, although we are seeing it now in 20s and 30 year olds. There is more lifestyle driven. Lack of physical activity, smoking, hypertension. They're all drivers. But the biggest driver of type 2 diabetes is in fat. Obesity.

[Tim Harford]

Obesity may be the biggest driver, but some obese people will never develop type 2 diabetes and some slimmer people will. This is because some people, and indeed some populations, are genetically predisposed to developing the condition.

[Professor Diana Magliano]

Certain racial groups are more likely to get type 2 diabetes. The white people are protected, but people from Asia and India and Pakistan and indigenous people have got a much higher risk of type 2 diabetes and a stronger family history of type 2 diabetes as well.

[Tim Harford]

Diana has been looking at global diabetes statistics for decades. In the Diabetes World Atlas, she used data from government health agencies and some extrapolation to calculate that 590 million people around the globe are currently living with diabetes. The majority of them have type 2 diabetes. This number is likely to be an underestimate due to some countries under diagnosing, but it is the best number we have. But wait a minute. If 590 million people have diabetes globally.

[Ad Voice 3]

And 20 years ago there was no diabetes in China. Today, 50% of the population is diabetic.

[Tim Harford]

That would mean 700 million people in China have diabetes and that would mean that every single person diagnosed with diabetes is Chinese and in fact that the rest of the world has negative 100 million diabetics. Now, I'm not a doctor, but that doesn't seem very likely. So RFK Jr's 50% figure can't possibly be right?

[Professor Diana Magliano]

No, it's at about 12%.

[Tim Harford]

Ah.

[Professor Diana Magliano]

Type 2 diabetes is always lower in the rural communities. We were still living on the land having their traditional diets, but in urbanised communities, where they're living in big urban cities with pollution and junk food and affluent life, diabetes is really taking a hold. And that's what's happening in China.

[Tim Harford]

However, Diana says that RFK Jr. S claim about the numbers shooting up does reflect what she found when she was compiling her diabetes atlas, the birth atlas.

[Professor Diana Magliano]

That we wrote in 2000. It was under 1% of people in China would have diabetes. And now in the 11th edition of the Atlas, 11.9% of Chinese adults aged 20 to 79 have diabetes.

[Tim Harford]

That could partly be due to undercounting or under diagnosis. But it's also likely that lifestyle factors and urbanisation, plus genetic disposition and a rapidly aging population have made these numbers shoot up. However, the rise was from under 1% to just under 12%, not 50%.

[Professor Diana Magliano]

There's no monkey that's got 50%. So the highest country is Pakistan was about 30, 31% and some of the Pacific islands got really high.

[Tim Harford]

One such place that demonstrates how quickly incidence of diabetes can spread is Nauru, a small island in Micronesia to the northeast of Australia.

[Professor Diana Magliano]

That was an island made of phosphate and they sold it their phosphate and got rich and stopped moving and didn't have to work and they got large and they got diabetes and they couldn't grow their food anymore because the land was destroyed from all the phosphate. So they had to buy all this food from New Zealand and Australia and was energy dense foods and they were living off junk food. So their diabetes prevalence hit 34% overall and it was 50% in some of the older age groups.

[Tim Harford]

In Nauru, all that happened in the space of 30 years. Currently, the increase in incidence of diabetes is higher in certain areas than others.

[Professor Diana Magliano]

Much higher burden of type 2 diabetes in middle income countries and high income countries. Even though the high income countries presented with it earlier and the low and middle income countries are still developing, the burden now for them is much higher because of their genetics and their ethnic group.

[Tim Harford]

One of the important things to note when looking at the data around diabetes in countries such as the US and the UK is that although the percentage of people who have diabetes is growing, the rate of new cases is stabilising and in some places reducing.

[Professor Diana Magliano]

Prevalence is generally rising everywhere because we're living longer with diabetes, because we're managing it so much better. European white populations, we actually think the incidence of type 2 might be starting to stabilise, in fact, but it doesn't mean that prevalence doesn't go up because people are still staying alive with it.

[Tim Harford]

An alarming development in higher income countries is that people are being diagnosed with type 2 diabetes at a younger age.

[Professor Diana Magliano]

So I looked at eight countries, it was certainly going up in Japan and Korea and it was going up less in the white European populations.

[Tim Harford]

In the us, this problem extends to children.

[Ad Voice 3]

Today, one out of every three kids is prediabetic or diabetic.

[Tim Harford]

The Health Secretary is right in that the Centres for Disease Control and Prevention, the CDC recently reported that 1 in 3American children aged between 12 and 17 are pre diabetic. However, the National Health and Examination Survey, which provided the data for the CDC report, also found that 70% of teenagers with prediabetes do not develop diabetes. So while that figure is alarming, it is fixable. But how many American children actually have type 2 diabetes?

[Professor Diana Magliano]

It's really low. For type 2, it's 0.67 in 1000.

[Tim Harford]

Children in kids under 20, that's 1 in 1500. Although we are better at treating diabetes, it still carries a high burden of disease, especially in middle and lower income countries countries. Despite this, Diana says there is a sliver of hope.

[Professor Diana Magliano]

We can be cautiously optimistic that in at least high income countries we're managing to turn the tide. So the message of healthy life is.

[Tim Harford]

Getting through eventually, thanks to Professor Diana Magliano. And that's all we have time for this week. If you see any suspicious stats, please email in to more or lessbc.com until next week. Goodbye.

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