The short answer: 23 is the number to know
If you are an Asian American man, the BMI that should prompt a diabetes test is 23, not the 25 used for the general population. The reason is body composition: at the same BMI, Asian adults tend to carry a higher share of body fat, and more of it deep in the abdomen, where it drives insulin resistance.
The U.S. Preventive Services Task Force recommends screening adults aged 35 to 70 who have overweight or obesity, and says clinicians should consider screening at a lower BMI, 23 or higher, in Asian American patients. In the same 2021 statement, it summarizes the American Diabetes Association’s advice: test adults with a BMI of 25 or more, or 23 or more in Asian Americans, who have at least one risk factor, regardless of age.
The NIDDK puts it simply: Asian Americans are considered overweight at a BMI of 23 or higher. For a man who is 5 feet 8 inches, that line falls at roughly 151 pounds, a weight most charts would call healthy.
Why diabetes shows up at a lower weight
Asian Americans develop type 2 diabetes at lower body weights because of where their fat sits and how much there is. A review commissioned with the American Diabetes Association, published in Diabetes Care in 2015, laid out the evidence:
- At similar BMI levels, diabetes is more common in Asian adults than in white adults.
- Asian adults show a tendency toward visceral fat, the deep belly fat around the organs, which is more closely tied to insulin resistance than fat elsewhere.
- Asian men and women carry a higher percentage of body fat at any given BMI than non-Hispanic white adults.
The review’s practical findings are striking. Limiting screening to a BMI of 25 or higher would miss 36% of Asian Americans with newly diagnosed type 2 diabetes, while a cut point near 23.5 identified about 80% of undiagnosed cases in one study. That is the evidence behind the lower line.
What the local numbers look like
The pattern shows up in Los Angeles County data. In the 2023 Los Angeles County Health Survey, based on self-reported height and weight with standard BMI cutoffs, 10.1% of non-Hispanic Asian adults had obesity, compared with 29.5% of adults countywide. Yet 10.3% of Asian adults reported ever being diagnosed with diabetes, close to the countywide figure of 11.4%. Among foreign-born Asian adults, obesity was 8.9% while diabetes was 12.5%.
In other words, Asian adults in the county had about a third of the countywide obesity rate and nearly the same diabetes rate. A man who judges his risk by the mirror or the standard BMI chart can be misled.
| LA County adults, 2023 | Obesity (BMI 30+) | Ever diagnosed with diabetes |
|---|---|---|
| All adults | 29.5% | 11.4% |
| Non-Hispanic Asian adults | 10.1% | 10.3% |
| Foreign-born Asian adults | 8.9% | 12.5% |
Which tests catch it early
Three standard blood tests screen for prediabetes and diabetes, and the USPSTF lists all three: HbA1c, fasting plasma glucose and the oral glucose tolerance test (OGTT). Per MedlinePlus, an HbA1c below 5.7% is normal, 5.7% to 6.4% indicates prediabetes, and 6.5% or higher indicates diabetes. Reference ranges can differ slightly by lab, and a high result is usually confirmed with a repeat or a second type of test.
There is a catch for Asian American men. The 2015 review reported that relying on an HbA1c of 6.5% or higher alone failed to identify almost half of Asian Americans with diabetes in one study, and that many with high blood sugar only after a glucose drink would be missed without an OGTT. If your HbA1c is borderline and your risk is high, ask whether a glucose tolerance test makes sense.
| Test | What it shows | Notes for Asian American men |
|---|---|---|
| HbA1c | Average blood sugar over about three months | Convenient, no fasting; can miss some cases |
| Fasting glucose | Blood sugar after an overnight fast | Useful alongside HbA1c |
| Oral glucose tolerance test | How you handle a sugar load over two hours | Catches post-meal spikes the others miss |
| Fasting insulin, HOMA-IR | How hard the pancreas is working | Not a diagnostic test; can flag insulin resistance early |
Fasting insulin deserves an honest note. It is not one of the tests guidelines use to diagnose diabetes. It can, however, show that your body is producing a lot of insulin to keep glucose normal, an early sign of insulin resistance. Our pages on the fasting insulin test and the HOMA-IR score explain how to read those numbers, and the HbA1c test for men page covers the main screening test.
What to do with this
If you are an Asian American man with a BMI of 23 or more, or you are over 35 and have not had a glucose test in three years, it is time to check. Factors that add weight to that decision include a parent or sibling with diabetes, high blood pressure, high triglycerides or low HDL, a waist that has grown while your weight barely moved, and little regular exercise.
A normal BMI does not settle the question, and a tape measure often says more than a scale. Our comparison of body composition analysis vs BMI shows why, and the shorter answer on why Asian American men get diabetes at a lower BMI is a quick reference. For a closer look at regional risk around Downey, see our article on prediabetes in southeast LA County.
How Ultimate Male screens for it
Preventative blood testing at Ultimate Male ranges from a 40+ biomarker comprehensive panel to targeted panels. On the free call, ask which glucose markers your panel includes, such as HbA1c, fasting glucose or fasting insulin, and mention your background so the right ones are added. Draws are on site and same day at San Gabriel or Downey, with results in 24 to 48 hours.
A provider then goes through the numbers with you, including your waist measurement and family history, not just your BMI, and you can ask that your results be read against the lower Asian American BMI line. If something is borderline, you leave with a clear plan for what to repeat and when. Call 626-319-5261 for the free 10-minute phone call.
