Gestational Diabetes: Symptoms, Diet and Care

Gestational diabetes means that your blood sugar has risen above the usual range for the first time during pregnancy. It tends to appear in the middle of pregnancy, and for most women it settles once the baby is born. Hearing the diagnosis can be frightening, but it is common, it is manageable, and finding it early is what protects you and your baby.

This guide explains why it happens, how doctors look for it, what a sensible eating pattern can look like in an Indian kitchen, and the signs that mean you should call your doctor without waiting for the next visit.

What Is Gestational Diabetes?

During pregnancy the placenta releases hormones that make the body’s cells respond less well to insulin. Most women simply make extra insulin to cope. When the body cannot keep up, sugar builds up in the blood. The World Health Organization describes it as raised blood glucose that first shows up in pregnancy but is not high enough to count as diabetes outside pregnancy.

It is not caused by eating one sweet too many, and it is not your fault. Hormones, family history and body weight all play a part.

Who Is More Likely to Get It?

Anyone can develop it, but the chance is higher if you:

• Are over 40, or have a body mass index above 30
• Had gestational diabetes in an earlier pregnancy
• Have a parent or sibling with diabetes
• Previously delivered a very large baby (4.5 kg or more)
• Are of South Asian family background, which the NHS lists as a risk factor
• Have had weight-loss surgery

Many women with none of these still develop it, which is why screening is offered widely rather than only to those at risk.

Symptoms: Why Testing Matters

Most women with gestational diabetes feel completely well. Some notice extra thirst, passing urine more often, a dry mouth, tiredness or blurred vision, but these are also common in normal pregnancy, so they cannot be used to diagnose it. That is why the condition is found through a blood test and not through symptoms.

Remember: feeling fine does not mean your sugar is fine. Do not skip the glucose test because you have no symptoms.

How Is It Diagnosed?

Testing usually happens between 24 and 28 weeks of pregnancy, and earlier if you are at higher risk or had it before. In many countries this is a two-hour oral glucose tolerance test: you fast overnight (usually 8 to 10 hours), have a blood sample taken, drink a measured glucose drink, rest, and have a second sample after two hours.

India has its own approach. Indian guidelines have long used a one-step test in which you drink 75 g of glucose and a single blood sample is taken two hours later, with a reading of about 140 mg/dL (7.8 mmol/L) or above counted as gestational diabetes. This test can be done without fasting, which makes it easier for busy mothers to complete. Different countries and professional bodies use different cut-offs and steps, so guidelines vary. Your doctor will tell you which method applies to you.

Eating Well With Gestational Diabetes

Food is the first treatment. The aim is steady blood sugar, not starvation. A dietitian or your doctor can build a plan around your weight, your activity and your usual meals, because the right amount of carbohydrate differs from woman to woman. These ideas are general and widely used:

• Eat small meals and planned snacks instead of two or three large meals, so sugar does not spike and crash
• Keep portions of rice, chapati and other starches moderate and fill half the plate with vegetables
• Choose slower carbohydrates such as millets, whole wheat, brown or parboiled rice, and add dal, sprouts, curd, eggs, fish or paneer for protein
• Go easy on sugar-rich items: sweets, sugary tea, packaged juice, and bakery items. Whole fruit in small portions is usually better than fruit juice
• Drink water and avoid sweetened drinks
• Do not skip meals, especially breakfast

For general nutrition in pregnancy, see our guide to foods to eat during pregnancy, and then adjust it with your doctor’s advice.

Staying Active and Checking Your Sugar

Gentle movement helps your muscles use sugar. A short walk after meals, swimming or prenatal yoga are the options often suggested, once your doctor has said they are safe for you.

You may be given a glucometer to check your blood sugar at home and asked to note the readings, usually fasting and after meals. These readings guide your doctor. If diet and activity are not enough, you may be advised tablets or insulin injections. Needing it does not mean you did anything wrong.

What Could Go Wrong If It Is Not Controlled?

Well-controlled sugar greatly lowers these risks, but it helps to know them. According to the NHS, poorly controlled gestational diabetes can lead to:

• A larger-than-usual baby, which can make delivery harder and raise the chance of induction or a caesarean birth
• Too much amniotic fluid
• Early birth, before 37 weeks
• Pre-eclampsia (high blood pressure in pregnancy)
• Low blood sugar or jaundice in the baby after birth

Your team may suggest extra growth scans and plan the timing of birth. The NHS suggests that birth is best before 41 weeks, and sooner if there are concerns. Read about normal delivery and C-section to understand the options.

After the Baby Arrives

Blood sugar usually returns to normal soon after delivery, but the story does not end there. Women who have had gestational diabetes are more likely to develop type 2 diabetes later. The NHS advises a blood test for diabetes about 6 to 13 weeks after birth and then a yearly check. Eating well, staying active and keeping a healthy weight lowers that risk.

Common Myths, Gently Corrected

• “I ate too much sugar.” Hormones and body make-up drive this condition far more than any single food. Guilt does not help; steady habits do
• “I must stop eating rice completely.” Most women do not need to remove staples, only to control portions and pair them with vegetables and protein
• “Eating for two means double the food.” A pregnancy needs only a modest increase in energy, and quality matters more than quantity
• “Once the sugar is normal, I can relax.” The follow-up test after birth is what shows whether sugar has truly returned to normal

It also helps to bring a family member, such as your husband or mother-in-law, to a diet counselling session, because the person who cooks should understand the plan. Small changes at home, such as keeping a bowl of cut vegetables and roasted chana ready for snacking, make the plan easier to follow.

When to Call or Visit

Contact your doctor promptly, without waiting for your next appointment, if:

• Your home readings are repeatedly above the targets you were given
• You have strong thirst, a lot of urination, vomiting, or you feel very unwell or drowsy
• Your baby is moving less than usual
• You notice severe headache, vision changes or sudden swelling, which can signal pre-eclampsia (read our pre-eclampsia guide)

Chaitanya Hospital in Kadapa lists high-risk pregnancy care, including care for gestational diabetes, among its specialities. You can book an appointment or call +91 944 103 0587. Delivery and emergency care are open 24/7. You can read more about high-risk pregnancy care, or our overview of high-risk pregnancy.

This article is for general education only. It is not a substitute for a doctor’s advice, diagnosis or treatment. Please talk to your own doctor about your situation.