Ancestry, Context & Risk: Personalising Without Stereotyping
“Two women, both 40, both BMI 24, both with a normal fasting glucose. One is of South Asian heritage, one of northern European heritage. Should your plan for them be the same?”
The teaching
- Why this lesson exists. Risk is not spread evenly across populations. Some groups develop certain conditions earlier, at lower body weights, or with different risk patterns. Ignoring this means missing risk early; over-applying it means stereotyping. The skill is to use ancestry as a prompt to look, not as a verdict.
- Ancestry is a proxy, not a cause. Group labels such as "South Asian" or "Arab" cover enormous within-group variation, and they stand in for a mixture of genetics, body composition, diet, environment, migration, income, discrimination and access to care. Teach learners to ask what the label may be standing in for, and to assess the individual. A reported 2022 review of race- and ethnicity-based screening guidance illustrates the risk: hepatitis B guidance listing Asian heritage as a risk factor may really reflect country of birth, exposure and infection history (Siddique, as reported by MDedge, 2022; conference presentation, not a peer-reviewed paper). A counterpoint noted in the same report is that some ethnic or country-of-origin factors do affect risk, so the answer is to be specific, not to ignore the pattern.
- South Asian heritage (best-evidenced example).
- Diabetes: migrant South Asians in high-income countries have a much higher risk of type 2 diabetes than white Europeans, tend to develop it roughly 5–10 years earlier, often at a lower BMI, and appear more insulin resistant across the life course; differences in body composition (more body fat, more deep subcutaneous and visceral fat, less lean mass, lower cardiorespiratory fitness) are likely contributors. The authors found no clear evidence that genetics is a major factor, and note that epigenetic influences may play a role (Lancet Diabetes Endocrinol, 2015).
- BMI: a WHO expert consultation found that a substantial share of Asian people have high risk of type 2 diabetes and cardiovascular disease at BMIs below the standard overweight cut-off of 25 kg/m², and proposed additional public-health action points at 23.0 and 27.5 kg/m² while keeping the international classifications (WHO Expert Consultation, Lancet 2004). The data did not support one single cut-off for all Asian populations.
- Heart attack: in INTERHEART, the average age at first heart attack was 53.0 years in South Asian countries versus 58.8 years elsewhere. The authors concluded that this earlier age is largely explained by higher risk-factor levels at younger ages, for example a higher ApoB/ApoA-I ratio and diabetes, together with lower rates of regular exercise and daily fruit and vegetable intake in the South Asian arm (Joshi et al., JAMA 2007).
- Teaching point: earlier risk, and risk at lower weight, mean that for many people of South Asian heritage it is reasonable to look sooner and more carefully at waist measurement, glucose and insulin handling, lipids including ApoB, blood pressure, fitness and strength. This links directly to the testing reference ("Beyond the Standard Panel") and to Lesson 4.4.
- Middle Eastern and Arab heritage.
- Vitamin D: despite abundant sunshine, vitamin D deficiency is very common. A systematic review of apparently healthy people in the UAE found a pooled adult mean of 17.63 ng/mL across 17 studies and cites Middle East and North Africa adult figures of 44–96% with hypovitaminosis D. Contributing factors include limited skin exposure through clothing, extreme heat discouraging outdoor activity, darker skin pigmentation, low dietary intake and obesity; assay differences can also affect measured values (Alshamsi et al., Front Nutr 2025). This is a population pattern in the UAE and the wider region, not a rule for every individual or for people of Arab heritage living elsewhere.
- Teaching point: check vitamin D status rather than assuming sunshine protects, and ask about sun exposure, clothing, indoor work and diet.
- Mediterranean and Middle Eastern heritage: enzyme and inherited conditions. G6PD deficiency is an inherited enzyme condition with a Mediterranean variant that is the main cause in some populations, for example Kurdish Jews, where it affects about 70% of males (Oppenheim et al., Hum Genet 1993). It matters because it can affect how a person responds to certain medicines and foods. Learners are taught only the principle: ask about family history, and refer for testing before recommending anything that could cause problems for a person with a suspected enzyme deficiency. [Dr Haq and clinical reviewer to add other relevant inherited conditions once sources are verified.]
- Heritage patterns at a glance. The table below lists only patterns with published support. Each row is a prompt to ask a question and look at the individual, not a prediction. Always check the person's own family history, country of origin and circumstances first.
Heritage | Pattern with published support | What it prompts you to ask or consider | Caution |
|---|---|---|---|
South Asian | Earlier type 2 diabetes (roughly 5–10 years), often at lower BMI; first heart attack about 6 years earlier on average, largely explained by higher risk-factor levels at younger ages | Waist, glucose and insulin handling, lipids including ApoB, blood pressure, fitness and strength, earlier and more carefully | Mainly body composition, fitness and environment; no proven single genetic cause |
East Asian | The ALDH2 enzyme deficiency behind the "alcohol flush" is common in East Asia. Flushing has been linked to higher oesophageal cancer risk among people who drink, especially those with partial enzyme activity. US diabetes guidance has recommended screening Asian Americans at a lower BMI than other adults (23) | Ask about flushing and alcohol habits; consider earlier diabetes checks at a lower BMI | "East Asian" covers very different populations; the BMI 23 guidance is for Asian Americans; flushing is a risk signal for people who drink, not a reason to drink less or more without advice |
Black African and Caribbean | In a 30-year south London stroke register, hypertension was 29% more prevalent in Black Caribbean and 47% more prevalent in Black African participants than in white participants; diabetes was about twice as common; strokes occurred at younger ages; 12% of strokes in Black African participants happened with no prior risk-factor diagnosis (6% in white participants); about a third of all strokes occurred in people with a diagnosed but untreated risk factor. High-risk APOL1 gene variants, linked to some kidney diseases, are found mainly in people of recent African ancestry, but most people with them never develop clinically apparent kidney disease | Blood pressure checked and followed through, glucose, and kidney health; ask whether known risk factors are actually being treated | Socioeconomic and access factors matter as much as ancestry in the stroke data. APOL1 results are not by themselves actionable, there is no routine-screening recommendation, and testing carries risks of stigma. Do not suggest APOL1 testing |
Ashkenazi Jewish | About 2.5% carry one of three BRCA1 or BRCA2 founder mutations | Ask about breast and ovarian cancer in the family; refer for genetic counselling where there is a history | Most people are not carriers; genetic results need counselling, not a consumer report |
Mediterranean, Middle Eastern, South Asian and South-East Asian | Beta-thalassaemia is common across the Mediterranean basin, the Middle East, the Indian subcontinent and South-East Asia. Carrier frequencies are generally about 1–20%, for example about 7.4% in Greece, 12–15% in Cyprus, 4–8% in Iran, 2.1% in Turkey and 1–11% in Arab countries | Ask about family history of thalassaemia or inherited anaemia; leave interpretation of blood results to a clinician | Carriers are often well but have unusual blood counts. Coaches should not suggest iron or other supplements for unexplained blood-count findings |
Non-Ashkenazi Jewish, Armenian, Turkish and Arab | Familial Mediterranean fever, a recessive inherited condition, is highly prevalent in these groups: recurrent short attacks of fever and pain, with amyloidosis and kidney failure in a subset | Recurrent unexplained fever and pain episodes warrant referral and a family-history question | Uncommon overall; patterns differ between groups |
Middle Eastern / Mediterranean | Vitamin D deficiency (UAE and wider region) and G6PD deficiency, covered above | Check vitamin D; ask about family history of G6PD deficiency | Regional pattern, not a rule for every individual |
Further heritages (for example Hispanic and Latin American, Southeast Asian, Pacific Islander, Indigenous populations) will be added once sources are verified. 7. How to ask well. "Where does your family come from?" is a relevant clinical question when asked with a reason: "Some health patterns run differently in different families and communities, so it helps me to know." Always record the person's own description, not an assumption from name or appearance. 8. Culture is more than risk. Food, fasting, family structure, attitudes to medicine and exercise, and language all shape what plan will work (links to Lesson 5.2's explanatory models). A plan that respects them is more likely to be followed. 9. Genetic testing. Direct-to-consumer ancestry and genetic reports are not clinical tests. A risk "score" is not a diagnosis, and results should be interpreted with a clinician or genetic counsellor. This lesson does not recommend any consumer genetic test.
Practitioner / Coach translation
Practitioner | Coach |
|---|---|
Use ancestry as one input to risk assessment and investigation choices; document the person's own description | Use it to tailor the conversation and habits (earlier waist, activity and diet attention); refer anything beyond that |
May order or interpret relevant tests (glucose, insulin, ApoB, vitamin D, enzyme tests) | Suggest the person discuss earlier checks with their clinician |
Myth vs Reality
Ancestry-based risk means your genes decide your health.
For South Asian diabetes risk, the evidence points mainly to body composition, fitness and environment rather than a proven single genetic cause. Patterns are real, and they are modifiable.
Dr Haq’s 30 Seconds
A short personal take from your course director
Recording to come — 20–40 seconds in Dr Haq’s own words. Suggested angle: What you see in clinic and how you raise ancestry-related risk sensitively with patients.
A note on the evidence
South Asian diabetes and heart-attack patterns: well supported by large studies and reviews. WHO BMI action points: expert consensus, with variation between populations. Middle Eastern vitamin D deficiency: well documented, with regional and measurement variation. G6PD: inherited and well established, with variants differing by population. Use of ancestry in risk algorithms: contested and evolving.
Patient Journey — Checkpoint 18
Richard says his family is from Nigeria and asks, "Does that change my risk?" Write what you would say. What would you ask him next, what would you avoid assuming, and what individual measures would you rely on rather than his ancestry?
How would you apply this lesson to Richard?
Mini case
Priya, 38, of South Asian heritage, BMI 24, fasting glucose 5.2, waist 88 cm, father diagnosed with type 2 diabetes at 46. What would you consider earlier or differently for her, and how would you explain why without alarming her?
Reflect before you move on
When have you assumed something about a person's health from their name, appearance or background? What did it cost?
Format: Video · text · family-and-ancestry history question card (downloadable) · quiz.
References
- López-Otín C, Blasco MA, Partridge L, Serrano M, Kroemer G. The hallmarks of aging. Cell 2013;153:1194–1217; and The hallmarks of aging: an expanding universe. Cell 2023;186:243–278. (As cited in Module 1.)
- Epel ES, Blackburn EH, Lin J, Dhabhar FS, Adler NE, Morrow JD, Cawthon RM. Accelerated telomere shortening in response to life stress. Proc Natl Acad Sci USA 2004;101(49):17312–17315.
- Telomere Research Network. Recommendations for the measurement of telomere length in population studies (precision and measurement error).
- Watson NF, Badr MS, Belenky G, et al. Recommended amount of sleep for a healthy adult: a joint consensus statement of the American Academy of Sleep Medicine and Sleep Research Society. J Clin Sleep Med 2015;11:591–592.
- Cappuccio FP, D'Elia L, Strazzullo P, Miller MA. Sleep duration and all-cause mortality: a systematic review and meta-analysis of prospective studies. Sleep 2010;33:585–592.
- McEwen BS. Protective and damaging effects of stress mediators. N Engl J Med 1998;338:171–179.
- Levy BR, Slade MD, Kunkel SR, Kasl SV. Longevity increased by positive self-perceptions of aging. J Pers Soc Psychol 2002;83:261–270.
- Cruz-Jentoft AJ, Bahat G, Bauer J, et al. Sarcopenia: revised European consensus on definition and diagnosis. Age Ageing 2019;48:16–31.
- WHO Expert Consultation. Appropriate body-mass index for Asian populations and its implications for policy and intervention strategies. Lancet 2004;363:157–163.
- Joshi P, Islam S, Pais P, et al. Risk factors for early myocardial infarction in South Asians compared with individuals in other countries. JAMA 2007;297:286–294.
- Type 2 diabetes in migrant south Asians: mechanisms, mitigation, and management. Lancet Diabetes Endocrinol 2015;3:1004–1016.
- Alshamsi MA, Fatima W, Al Teneiji MT, Srinivasamurthy SK. Vitamin D status among apparently healthy individuals in the UAE: a systematic review. Front Nutr 2025;12:1604819.
- Oppenheim A, Jury CL, Rund D, Vulliamy TJ, Luzzatto L. G6PD Mediterranean accounts for the high prevalence of G6PD deficiency in Kurdish Jews. Hum Genet 1993;91:293–294.
- Kling J. Race-, ethnicity-based clinical guidelines miss the mark: study (report of Siddique S, Digestive Disease Week 2022). MDedge Family Medicine, 27 May 2022.
- Kauff ND, Perez-Segura P, Robson ME, et al. Incidence of non-founder BRCA1 and BRCA2 mutations in high risk Ashkenazi breast and ovarian cancer families. J Med Genet 2002;39:611.
- El-Shanti H, Majeed HA, El-Khateeb M. Familial Mediterranean fever in Arabs. Lancet 2006;367:1016–1024.
- De Sanctis V, Kattamis C, Canatan D, Soliman AT, et al. β-Thalassemia distribution in the Old World: an ancient disease seen from a historical standpoint. Mediterr J Hematol Infect Dis 2017;9(1):e2017018.
- Ojo AO, et al. APOL1 kidney disease: conclusions from a Kidney Disease: Improving Global Outcomes (KDIGO) Controversies Conference. Kidney Int 2025;108:763–779.
- Emmett E, O'Connell M, et al. South London Stroke Register analysis of ethnic and socioeconomic inequalities in stroke (30-year data). eClinicalMedicine 2026 (as reported by King's College London, July 2026).
- Brooks PJ, et al. The alcohol flushing response: an unrecognized risk factor for esophageal cancer from acetaldehyde exposure. PLoS Med (as reported in press coverage).
- American Diabetes Association guidance lowering the diabetes screening BMI threshold for Asian Americans to 23 (2015), as summarised by diaTribe. Press coverage differs on the exact wording and later changes; confirm the current ADA position before relying on it.
- Leong DP, Teo KK, Rangarajan S, et al. Prognostic value of grip strength: findings from the Prospective Urban Rural Epidemiology (PURE) study. Lancet 2015;386:266–273.
- Northey JM, Cherbuin N, Pumpa KL, Smee DJ, Rattray B. Exercise interventions for cognitive function in adults older than 50: a systematic review with meta-analysis. Br J Sports Med 2018;52(3):154–160.
- World Health Organization. Guidelines on physical activity and sedentary behaviour. 2020.
Key Points
- Tell people what a number is, what it is not, and what happens next, especially "biological age" results.
- Ask every person about sleep, stress and movement, and keep a record.
- Offer two or three sleep foundations and let the person pick one.
- Look for the signals of distress before deciding that stress is "good."
- Start strength and balance work early, and keep it gradual.
- Always ask the red-flag questions; refer promptly and document it.