Diabetes Risk for Asian Adults: What You Need to Know

Diabetes risk for Asian adults is higher at a lower body weight than it is for many Western populations. The reason is body composition: Asians tend to carry more fat around the internal organs and develop insulin resistance sooner, so type 2 diabetes and its complications can show up at a BMI that looks perfectly healthy by the old Western chart. That's why major health bodies use lower BMI thresholds for Asians, flagging increased risk from a BMI of 23 rather than 25. If you're of Asian descent, this is worth understanding, because the number on the scale can hide a risk that's already building. Here's what to know.

What is type 2 diabetes?

Type 2 diabetes is a condition where your blood sugar stays too high because your body can't use insulin properly. Insulin is the hormone that moves sugar from your blood into your cells for energy. Over time, the cells stop responding to it well, a state called insulin resistance, and the sugar builds up in your blood instead. Left unmanaged, that high blood sugar damages blood vessels, nerves, kidneys, eyes, and the heart.

It usually develops slowly, often over years, and there's a warning stage before it called prediabetes, where blood sugar is higher than normal but not yet diabetic. Prediabetes matters, because catching it early is often the point where lifestyle changes can stop the slide. The problem is that neither prediabetes nor early type 2 diabetes tends to announce itself.

Why are Asian adults at higher risk?

The core reason is where the body stores fat and how early insulin resistance sets in. According to StatPearls (NCBI), Asian populations face a substantial risk of type 2 diabetes, cardiovascular disease, and related conditions at lower BMIs than other groups, largely because they tend toward central adiposity, meaning more fat packed around the organs in the belly. That visceral fat is far more metabolically harmful than fat under the skin.

So an Asian adult can look slim, have a BMI that reads as normal, and still carry the kind of hidden central fat that drives insulin resistance. This is sometimes described as being metabolically at risk despite a healthy weight. Genetics play a part too, and rapid changes in diet and activity across Asia, more processed food, more sugary drinks, more sitting, have pushed rates up quickly. Your waist circumference is often a better warning sign here than your weight alone.

At what BMI does the risk rise?

This is where the numbers get specific. Back in 2004, the World Health Organization proposed lower BMI cut points for many Asian populations, since the same health risks appeared at lower weights. As summarised in StatPearls, the WHO categories mark 18.5 to 22.9 as acceptable, 23 to 27.5 as increased risk, and 27.5 or above as high risk, compared with the Western thresholds of 25 for overweight and 30 for obesity.

The diabetes-screening world followed. The American Diabetes Association recommends that Asian Americans be screened for prediabetes and type 2 diabetes from a BMI of 23, rather than the 25 used for the general population, per a study in Diabetes Care. Some countries go further still: Japan defines obesity from a BMI of 25, a full five points below the Western standard, because obesity-related conditions appear at lower weights. The takeaway is simple. If you're Asian, don't wait for a BMI of 25 or 30 to take your risk seriously. It rises from 23. Our healthy BMI for Asians guide explains the bands in full.

How common is diabetes in Singapore and Asia?

Common, and growing. In Singapore, about 9.1 percent of residents aged 18 to 74 had diabetes in the Ministry of Health's 2024 National Population Health Survey, and the Ministry notes that one in three Singaporeans has a lifetime risk of developing the condition, with numbers projected to reach one million by 2050 if trends hold, per Singapore's Ministry of Health.

The wider picture is just as striking. The International Diabetes Federation estimates that 589 million adults worldwide are living with diabetes in 2025, including 107 million in South Asia alone, according to the IDF. And a big share goes undetected. Health authorities estimate that roughly one in three people with diabetes don't yet know they have it, because the early stage is so often silent. That combination, high prevalence plus low awareness, is exactly why screening is pushed so hard across the region.

What are the warning signs?

When symptoms do appear, the classic ones are worth knowing:

• Feeling unusually thirsty and drinking more than normal
• Needing to urinate often, including waking at night to go
• Losing weight without trying
• Feeling tired or low on energy
• Blurred vision
• Cuts, sores, or infections that heal slowly
• Tingling or numbness in the hands or feet

Here's the catch, and it's a big one. Early type 2 diabetes frequently has no symptoms at all, which is why so many people carry it for years unaware. You cannot rely on feeling unwell as your signal. If any of the signs above are present, see a doctor, but don't treat their absence as an all-clear.

How can you lower your risk?

The good news is that type 2 diabetes is often preventable or delayable, and the same habits help whether you're trying to avoid it or manage prediabetes:

• Aim for a healthy weight by Asian standards. Even losing a modest amount of excess weight can sharply cut risk. Use the lower Asian thresholds, not the Western ones.
• Watch your waist, not just the scale. Central fat is the real culprit, so waist size and waist-to-height measures often matter more than BMI alone.
• Move regularly. Activity helps your muscles use insulin better. Aim for around 150 minutes of moderate activity a week. Our exercise recommendations for Asian adults give a realistic starting point.
• Eat more whole foods, fewer refined carbs. Cut back on sugary drinks, white rice in large amounts, and processed snacks. More vegetables, fibre, and protein steady your blood sugar.
• Get screened. A simple blood test catches prediabetes early, when your choices make the biggest difference.

When should you get screened?

Because early diabetes is silent, screening is how most people find out in time. General guidance is to get a blood sugar check if you're an Asian adult with a BMI of 23 or above, especially if you also have a family history of diabetes, high blood pressure, high cholesterol, or a large waist. Many people benefit from a check even without those extras once they reach their 40s, and earlier if risk factors stack up.

Your doctor can advise on the right test and timing for you, whether that's a fasting glucose test, an HbA1c, or an oral glucose tolerance test. If you're not sure where you stand, that uncertainty is itself a good reason to book a check. Catching prediabetes is a genuine opportunity, not a diagnosis to dread.