Why 1 in 5 Pregnant Women in Singapore Develop Gestational Diabetes (And What Actually Helps)
If you've just been told you have gestational diabetes, the first thing worth knowing is that you're in very good company. Singapore has one of the highest gestational diabetes rates in the region, a large local study of pregnant women (the GUSTO cohort) found just over 1 in 5 had it, and Singapore's own health authorities put the figure at roughly 1 in 4 to 5, well above the 1 in 10 seen elsewhere in Southeast and East Asia. This isn't something you did wrong. It's partly biology, and partly the reality of pregnancy here.
Here's what's actually happening. As pregnancy progresses, the placenta produces hormones that naturally make your body more resistant to insulin, so more glucose stays in the bloodstream for the baby to use. This is normal. For some women, especially by 24 to 28 weeks, that resistance goes further than the body can comfortably manage on its own. This is also exactly why fasting glucose alone can look fine while the underlying insulin resistance is already there, a distinction I've worked with for years in nutrition coaching, not just in pregnancy but across metabolic health generally. It's why screening exists rather than waiting for symptoms, because there often aren't any.
In Singapore, screening usually happens in two stages: an early risk-based check in the first trimester for women with risk factors like a higher pre-pregnancy BMI, a history of PCOS, or a family history of diabetes, and then a universal glucose tolerance test for everyone between 24 and 28 weeks. The diagnosis itself is based on three thresholds during that test, and meeting even one is enough.
The part that tends to get lost in the anxiety of a new diagnosis is this: management works. Getting blood sugar into a healthier range through diet, movement, and monitoring can lower the risk of complications for both mother and baby by up to 60%. And the benefit doesn't stop at delivery. Women who keep up the same lifestyle habits after birth cut their own risk of developing type 2 diabetes over the next decade by around a third. This is one of those rare situations where the same daily choices protect you twice over.
On nutrition, the goal isn't to cut carbohydrates out, it's to change how they show up on your plate. Pairing carbs with protein, fibre, or healthy fat (think brown rice with fish and vegetables, rather than white rice alone) slows down how quickly glucose enters your bloodstream. Spacing meals fairly evenly through the day, rather than going long stretches without eating and then having a large meal, also helps keep things steadier. None of this needs to be extreme or restrictive. Most women manage this well with fairly ordinary adjustments to portion and pairing, not a complete overhaul of how they eat.
Movement matters just as much, and it doesn't need to be intense to help. A short walk after a meal, even 10 to 15 minutes, is one of the simplest and most consistently recommended ways to bring post-meal blood sugar down, because your muscles pull glucose out of the bloodstream while you move. Gentle, pregnancy-safe movement through the day, the kind we work through in prenatal classes, does the same thing over a longer stretch.
If you've been diagnosed, the most useful next step is working closely with your obstetric team and a dietitian, since your specific numbers and history will shape what your plan should actually look like. What's above is the general picture, the why behind the advice you're likely already getting, not a replacement for it.
Sources
Loo EXL, Zhang Y, Yap QV, et al. (2021), "Comparative epidemiology of gestational diabetes in ethnic Chinese from Shanghai birth cohort and growing up in Singapore towards healthy outcomes cohort," BMC Pregnancy and Childbirth, 21:566. Finding: gestational diabetes prevalence of 20.8% in the Singapore GUSTO cohort (n=677) using 1999 WHO criteria. Link: https://link.springer.com/article/10.1186/s12884-021-04036-5
Agency for Care Effectiveness (ACE), Ministry of Health, Singapore, "Gestational Diabetes Mellitus: An Update on Screening, Diagnosis, and Follow-up." Direct quote: prevalence of roughly "1 in 4 to 5 pregnant women," compared to about 1 in 10 elsewhere in the region; appropriate management "can lower the risk of maternal and neonatal complications by up to 60%"; postpartum lifestyle intervention reduces progression to type 2 diabetes "by 35% over a decade." Diagnostic thresholds: fasting ≥5.1 mmol/L, 1-hour ≥10.0 mmol/L, 2-hour ≥8.5 mmol/L (IADPSG criteria). Link: https://www.ace-hta.gov.sg/healthcare-professionals/acg/gestational-diabetes-mellitus----an-update-on-screening--diagnosis--and-follow-up-acg/
Ministry of Health, Singapore, "Incidence of Pregnant Women being Diagnosed with Gestational Diabetes." Finding: an average of approximately 2,950 women per year diagnosed in public hospitals, 2017 to 2021. Link: https://www.moh.gov.sg/newsroom/incidence-of-pregnant-women-being-diagnosed-with-gestational-diabetes