Being told you have gestational diabetes is frightening, particularly when you feel completely well. The diagnosis is common in Indian women, and the great majority of pregnancies affected by it end with a healthy baby and a healthy mother.
What determines that outcome is how consistently the blood sugar is controlled.
What Causes It
The placenta produces hormones that deliberately make the mother's tissues less responsive to insulin. This exists so that more glucose stays in the bloodstream and reaches the growing baby, which is normal and useful.
In some women the pancreas cannot produce enough extra insulin to compensate, and blood sugar rises. This is gestational diabetes. It usually appears in the second half of pregnancy, when placental hormone production peaks.
Indian women develop it at rates well above Western populations, at lower body weights, which is why screening thresholds here are appropriately cautious.
Who Is at Higher Risk
Several factors raise the likelihood, though gestational diabetes also occurs in women with none of them.
- South Asian ethnicity, independently
- A family history of type 2 diabetes
- Overweight before pregnancy, or rapid weight gain during it
- Previous gestational diabetes, which recurs in a substantial proportion
- A previous baby weighing over four kilograms
- PCOS
- Age over thirty
- Previous unexplained stillbirth
Because risk in Indian women is high across the board, universal screening rather than risk based screening is the standard here.
How Screening Works
The test is an oral glucose tolerance test, usually between twenty four and twenty eight weeks, and earlier if risk factors are present.
You fast overnight, a fasting sample is taken, you drink a measured glucose solution, and further samples are taken at one and two hours. Values above the threshold at any point establish the diagnosis.
The drink often causes nausea, which is unpleasant but temporary. Do not eat or walk about during the test, since both alter results. If you vomit, the test must be repeated on another day rather than interpreted.
Why Control Matters for the Baby
Glucose crosses the placenta freely. Insulin does not. So a mother's high sugar becomes the baby's high sugar, and the baby's pancreas responds by producing large amounts of its own insulin, which is a powerful growth hormone.
- Macrosomia: an unusually large baby, making delivery more difficult and caesarean more likely
- Shoulder dystocia: the shoulders becoming stuck during birth
- Newborn low blood sugar: the baby's high insulin continues after the maternal glucose supply stops at birth
- Newborn jaundice and breathing difficulty
- Higher lifetime risk of obesity and diabetes for the child
Babies of mothers with gestational diabetes are monitored closely after birth, and our neonatology team checks blood sugars in the first hours.
The Diet in Practice
Diet controls the majority of cases without medication. The principle is to spread carbohydrate through the day rather than eliminate it.
- Three moderate meals plus two or three small snacks, never skipping
- Replace white rice partly with hand pounded or brown rice, millets, or add more vegetables to the same plate
- Always pair carbohydrate with protein: curd with rice, dal with roti, nuts with fruit
- Avoid fruit juice, sweets and sugary drinks entirely
- Eat fruit whole, in the middle of the day rather than first thing
- Take a fifteen minute walk after each main meal, which lowers the post meal spike measurably
Blanket rice avoidance is neither necessary nor realistic for most South Indian households. Portion and pairing achieve more. Our dietitians work with families on this directly.
Monitoring and Medication
You will be asked to test your blood sugar at home, typically fasting and one or two hours after each main meal. This feels burdensome initially and becomes routine within a week.
Targets are usually a fasting value below 95 mg/dL and a one hour post meal value below 140 mg/dL, though your obstetrician may individualise these.
If diet and activity do not achieve target within one to two weeks, medication is added. Insulin is the most commonly used option and is entirely safe in pregnancy, as it does not cross the placenta. Needing insulin is not a failure on your part, it reflects how much the placenta is interfering with your own insulin.
Delivery and the Weeks After
Well controlled gestational diabetes on diet alone often allows a normal delivery at term. Where control has required insulin, or the baby is measuring large, delivery may be planned around thirty eight to thirty nine weeks.
Blood sugar usually returns to normal within days of the placenta being delivered, and medication is typically stopped immediately after birth.
Breastfeeding is strongly encouraged. It helps stabilise the baby's blood sugar and reduces the mother's future diabetes risk.
The Follow Up Most Women Miss
This is the single most important thing in this article. Gestational diabetes is a warning about your future health, and around half of affected women develop type 2 diabetes within a decade.
- A glucose tolerance test at six to twelve weeks after delivery, which many women never attend
- Blood sugar testing at least every one to three years thereafter, lifelong
- Screening early in any subsequent pregnancy
- Sustained attention to weight and activity, which substantially reduces the risk
Book the postnatal test before you leave hospital. Our diabetology department provides ongoing follow up for women in this group.
Gestational diabetes is manageable, and the effort it requires is concentrated into a few months. Consistency with diet, monitoring and walking after meals achieves control in most women without any medication at all.
For screening and management, contact our high risk pregnancy service at T. Nagar, Chennai.
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