Gestational diabetes (GDM) is raised blood sugar that develops or is first recognised during pregnancy. It is common in India - estimates range from about 10% to 15% of pregnancies, and South Asian women are at higher risk than many other groups. It often causes no symptoms at all, which is why every pregnant woman is tested rather than only those who feel unwell.
When sugar levels stay high, extra glucose crosses the placenta and the baby can grow too large, make too much fluid, or have low sugar and breathing difficulties after birth. Careful control brings most of these risks close to those of any other pregnancy. Most women manage with diet and activity alone; some need metformin or insulin for the remaining weeks.
Dr. Devang Patel, FNB (High Risk Pregnancy & Perinatology), manages gestational and pre-existing diabetes at Divine Women’s Hospital in Gota, Ahmedabad - reading your sugar charts, adjusting treatment, checking the baby’s growth on scan and planning the delivery in one place, with diet advice that fits a Gujarati home kitchen.
Why sugar rises in pregnancy
The placenta makes hormones that make the body less responsive to insulin, especially in the second half of pregnancy. Most women produce extra insulin to compensate. When the pancreas cannot keep up, blood sugar rises - this is gestational diabetes.
GDM is not caused by eating sweets during pregnancy, and it is not anyone’s fault. Genetics, body weight and the placenta’s hormones all play a part, which is why women who eat carefully can still develop it.
Because the hormone effect peaks after 24 weeks, GDM is usually found in the late second trimester. Raised sugar found in the first trimester is more likely to be diabetes that was present before pregnancy but never diagnosed.
Who is at higher risk
- South Asian ethnicity, which includes nearly all women in India
- BMI above 25, or weight gain before pregnancy
- A parent or sibling with diabetes
- PCOS
- Gestational diabetes or a baby over 3.5–4 kg in a previous pregnancy
- Age above 30, IVF conception, twins
Symptoms and how it is found
Most women with GDM feel completely well. Increased thirst, frequent urination and tiredness are common in pregnancy anyway, so symptoms are not a reliable guide. Recurrent urine or vaginal infections, or a scan showing a large baby or extra fluid, can be clues.
In India, testing is advised at the first antenatal visit and repeated at 24–28 weeks if the first test is normal. Women with strong risk factors may be tested again around 32 weeks if earlier tests were normal.
| Test | How it is done | Diagnostic values |
|---|---|---|
| DIPSI single-step (Government of India, FOGSI) | 75 g glucose without fasting, one sample at 2 hours | 2-hour value 140 mg/dL or more |
| IADPSG / WHO 75 g OGTT | Overnight fast, samples at 0, 1 and 2 hours | Fasting 92 or more, 1-hour 180 or more, or 2-hour 153 or more (any one) |
| HbA1c or fasting sugar early in pregnancy | Single blood test at the first visit | HbA1c 6.5% or more, or fasting 126 or more, suggests pre-existing diabetes |
Sugar targets and home monitoring
Once GDM is confirmed, you will check your sugar at home with a glucometer, usually fasting and after each main meal at first. The commonly used targets are a fasting value below 95 mg/dL, a 1-hour after-meal value below 140 mg/dL, or a 2-hour after-meal value below 120 mg/dL.
Readings are reviewed at each visit or shared between visits, so treatment can be stepped up early rather than late. Once readings are stable, testing can often be reduced to a few days a week.
Write down what you ate before a high reading. Patterns in the food diary usually show where a small change will make the biggest difference.
Diet that works in an Indian kitchen
The aim is steady sugar, not starvation. Three moderate meals and two or three small snacks keep levels even. Every meal should pair carbohydrate with protein and vegetables.
- Breakfast: vegetable poha or upma with sprouts, or besan chilla with curd, rather than plain white bread or sweet tea with biscuits
- Lunch and dinner: one or two rotlis of whole wheat, bajra or jowar, a large katori of dal or kadhi, sabzi and salad; keep white rice to a small portion
- Snacks: roasted chana, a handful of nuts, buttermilk, a small guava or apple
- Limit: sweets, fruit juice, sugar in tea, farsan such as fafda and khakhra in large amounts, and fried snacks
- Walk for 10–15 minutes after each main meal, which noticeably lowers after-meal sugar
Medicines when diet is not enough
If targets are not met after one to two weeks of diet and activity, medicine is added. About a quarter to a third of women with GDM need it. Needing medicine is not a failure; it reflects how the placenta’s hormones are affecting you.
| Option | How it works | Suited to |
|---|---|---|
| Diet and activity | Reduces sugar load and improves insulin response | All women with GDM, as the first step |
| Metformin tablets | Improves the body’s response to insulin | Mildly raised sugars, especially after meals, in women who tolerate it |
| Insulin injections | Replaces the insulin the body cannot make enough of | Clearly raised fasting sugars, high readings despite metformin, or a fast-growing baby |
Risks and how they are reduced
For the baby, uncontrolled sugar raises the chance of excess growth (macrosomia), shoulder difficulty at birth, extra fluid (polyhydramnios), low sugar after birth, jaundice and, rarely, stillbirth late in pregnancy. For the mother, it raises the chance of pre-eclampsia, caesarean and infections.
Women with GDM are also watched for BP and protein in the urine at each visit, since pre-eclampsia is more common, and asked to report any change in the baby’s movements promptly.
Growth scans every 3–4 weeks from about 28 weeks check the baby’s size and fluid. Good control, regular scans and timely delivery bring most of these risks down substantially.
Timing of delivery and the first days
GDM on its own is not a reason for a caesarean. Women whose sugars are well controlled on diet can usually wait for labour until about 40–41 weeks; those on metformin or insulin are generally offered delivery between 37 and 39 weeks, depending on control and the baby’s growth. A caesarean is discussed if the baby is estimated to be very large, generally above about 4–4.5 kg.
During labour, sugar is checked regularly and insulin given by drip if needed. After birth, the baby’s sugar is checked before feeds for the first day and early breastfeeding is encouraged, which also helps keep the baby’s sugar steady.
After pregnancy and future health
Most mothers can stop diabetes medicines straight after delivery. A repeat 75 g OGTT at 6–12 weeks after birth confirms whether sugar has returned to normal. Women who had GDM have up to a seven-fold higher chance of type 2 diabetes in later life, and about half develop it within 10 years in some studies, so a yearly sugar test matters.
GDM is likely to recur in a future pregnancy. Reaching a healthy weight, breastfeeding, staying active and having an early sugar test in the next pregnancy all help. Children born after a GDM pregnancy benefit from a healthy family diet too.
Your care, step by step
- Confirm the diagnosisYour OGTT or DIPSI report and early sugar tests are reviewed, and undiagnosed pre-existing diabetes is ruled out.
- Diet and home monitoringYou get a practical diet plan built around your usual foods and a glucometer schedule with clear target values.
- Adjust treatmentMetformin or insulin is added only if readings stay above target, and doses are reviewed regularly.
- Watch the babyGrowth scans from about 28 weeks check the baby’s size and fluid level.
- Plan the birth and follow-upTiming and mode of delivery are agreed, the baby’s sugar is checked after birth and a post-delivery OGTT is booked.
When to book a visit
- Your OGTT, DIPSI or fasting sugar report is above the normal range
- You had gestational diabetes or a baby over 3.5–4 kg in a previous pregnancy
- You have PCOS, a high BMI, or a parent or sibling with diabetes
- A scan shows a large baby or extra fluid around the baby
- You already have type 1 or type 2 diabetes and are pregnant or planning pregnancy
- Your home sugar readings are repeatedly above target
Warning signs - get same-day care
- Sugar readings below 60 mg/dL with sweating, shaking or confusion on insulin
- Repeated readings above 200 mg/dL, or vomiting with inability to eat
- Reduced baby movements
- Severe headache, visual disturbance or sudden swelling, signs of pre-eclampsia
- Leaking fluid or regular tightenings before 37 weeks
Labour and emergency care are available 24 × 7. Call the hospital and come in directly.
Myths and facts
Myth: If I avoid sugar completely, I will not need treatment.
Rice, roti, potatoes and fruit also raise sugar. Portion and pairing matter more than cutting out sweets alone.
Myth: Insulin in pregnancy will harm the baby or become a lifelong habit.
Insulin does not cross the placenta in meaningful amounts, and most women stop it immediately after delivery.
Myth: GDM always means a caesarean.
Many women with gestational diabetes have a normal vaginal delivery. Caesarean is for specific reasons such as a very large baby.
Myth: Once the baby is born, diabetes is gone for good.
GDM usually settles after birth, but the lifetime risk of type 2 diabetes is much higher, so yearly checks are needed.
Frequently asked questions
What is a normal sugar level in pregnancy?
For women being monitored at home, fasting sugar below 95 mg/dL, 1 hour after a meal below 140 mg/dL, or 2 hours after a meal below 120 mg/dL are the usual targets. For diagnosis, the thresholds depend on the test used - for example, 140 mg/dL at 2 hours on the DIPSI test.
Will gestational diabetes harm my baby?
Uncontrolled high sugar can lead to a large baby, a difficult birth, and low sugar or breathing problems in the newborn. With good control and regular growth scans, most babies of mothers with GDM are born healthy.
Is insulin safe in pregnancy?
Yes. Insulin does not cross the placenta in meaningful amounts and has been used in pregnancy for decades. Needing insulin does not mean you have failed at diet - some women simply need it to reach target.
Is metformin safe in pregnancy?
Metformin is widely used for gestational diabetes and has not been linked with birth defects. It does cross the placenta, so the choice between metformin and insulin is discussed individually.
Can I eat fruit if I have gestational diabetes?
Yes, in moderate portions. Whole fruits such as apple, guava, pear or orange are better than juices, and are ideally eaten as a snack rather than straight after a large meal. Mango, chikoo and grapes raise sugar more quickly, so keep portions small.
Can I eat rice with gestational diabetes?
A small portion of rice, eaten with dal, vegetables and curd rather than on its own, is usually fine. Your glucometer readings after the meal show whether the portion suits you.
Does gestational diabetes go away after delivery?
In most women it does, often within days. A repeat glucose test 6–12 weeks after birth is needed to confirm this, and yearly checks afterwards are advised because the chance of type 2 diabetes later in life is higher.
Will I need a caesarean because of GDM?
Not necessarily. Many women with gestational diabetes have a normal vaginal delivery. A caesarean is considered mainly when the baby is estimated to be very large or for other obstetric reasons.
Why is the DIPSI test done without fasting?
The single-step DIPSI test was designed for India so that women can be tested at any visit without returning fasting. It is recommended by the Government of India and FOGSI.
Will I get gestational diabetes again next time?
The chance of recurrence is high, roughly half in many studies. Losing weight before the next pregnancy, staying active and testing early in that pregnancy help.