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Gestational Diabetes (GDM): Dietary Care and Birth Preparation

• The Art of Parenthood HCTM UKM
gestational diabetes GDM pregnancy diet blood sugar

Gestational diabetes, commonly known as Gestational Diabetes Mellitus (GDM), is a type of diabetes that develops during pregnancy and usually resolves after delivery. It occurs when the mother’s body cannot produce sufficient insulin to meet the additional demands of pregnancy, causing blood sugar levels to rise.

In Malaysia, the rate of GDM is relatively high compared to the global average. Studies indicate that up to 18–24% of pregnant women in the country are diagnosed with GDM — nearly 1 in 5 pregnancies. Factors such as genetics, lifestyle, and a high-carbohydrate diet contribute to these statistics.

Who Is at Higher Risk?

Whilst any pregnant woman can develop GDM, several factors increase the risk:

  • Age over 25 at the time of pregnancy.
  • Body Mass Index (BMI) over 27 prior to pregnancy.
  • Family history of diabetes (parents or siblings).
  • History of GDM in a previous pregnancy.
  • Previously delivered a large baby (over 4 kg).
  • Asian descent — including Malay, Chinese, and Indian populations who carry a higher risk.
  • Polycystic Ovary Syndrome (PCOS).

How Is GDM Diagnosed?

In Malaysia, GDM screening is typically carried out between weeks 24 and 28 of pregnancy through an Oral Glucose Tolerance Test (OGTT):

  1. You are required to fast for 8–10 hours.
  2. A blood sample is taken during fasting.
  3. You are asked to drink a 75g glucose solution.
  4. Blood samples are taken again after 1 hour and 2 hours.

If any reading exceeds the normal threshold, you will be diagnosed with GDM.

Effects of Uncontrolled GDM

GDM that is not properly managed can pose risks to both mother and baby:

Risks to Baby

  • Macrosomia — an excessively large baby (over 4 kg), increasing the risk of delivery complications.
  • Neonatal hypoglycaemia — low blood sugar in the baby after birth.
  • More severe jaundice.
  • Future risk of obesity and diabetes.

Risks to Mother

  • Pre-eclampsia — dangerously high blood pressure.
  • Premature birth.
  • Unplanned caesarean section.
  • Risk of Type 2 diabetes after delivery — up to 50% of mothers with GDM may develop diabetes within 5–10 years.

Dietary Management: The Primary Weapon Against GDM

Diet is the first-line treatment for GDM. The goal is not to eat less, but to choose the right foods at the right times.

Basic Principles of a GDM Diet

Control Carbohydrates: Carbohydrates have the greatest impact on blood sugar. Choose complex carbohydrates such as brown rice, wholegrain bread, and sweet potatoes over white rice and white bread.

Eat at Regular Intervals: Practise 3 main meals and 2–3 small snacks daily. Do not let your stomach remain empty for too long, as this can cause sudden blood sugar fluctuations.

Pair with Protein and Healthy Fats: Every meal should contain a mix of carbohydrates, protein, and healthy fats. For example: brown rice + grilled fish + stir-fried vegetables.

Increase Fibre Intake: Vegetables, legumes, and whole grains help slow down sugar absorption into the bloodstream.

Avoid Simple Sugars: Reduce sweet drinks, pastries, excessive fruit juice, and foods containing hidden sugars.

Sample Daily Menu for Mothers with GDM

Breakfast: Wholegrain toast with boiled eggs and avocado.

Morning Snack: A handful of almonds and a small apple.

Lunch: Brown rice (1 cup) + roasted chicken + broccoli and carrots.

Afternoon Snack: Unsweetened yoghurt with chia seeds.

Dinner: Stir-fried rice vermicelli (minimal oil) + steamed fish + water spinach.

Evening Snack: Low-fat milk with plain crackers.

Exercise for GDM

Mild to moderate exercise can help lower blood sugar levels:

  • Walking for 15–30 minutes after meals.
  • Prenatal yoga — benefits both physical and mental wellbeing.
  • Swimming — a low-impact exercise suitable for pregnant women.
  • Stretching exercises — help maintain flexibility.

Always discuss with your doctor before beginning any exercise programme.

Birth Preparation for Mothers with GDM

Mothers diagnosed with GDM require more careful birth planning:

  • Frequent monitoring — clinic appointments may be more frequent to monitor baby size and blood sugar levels.
  • Induction — if the baby is too large or the pregnancy exceeds 40 weeks, the doctor may recommend induction.
  • Blood sugar monitoring during labour — to ensure stable sugar levels.
  • Postnatal baby assessment — the baby needs to be monitored for neonatal hypoglycaemia.

After Delivery: Does GDM Disappear?

In most cases, blood sugar levels return to normal after delivery. However, mothers who have had GDM are advised to:

  • Undergo a repeat OGTT 6–12 weeks after delivery.
  • Annual blood sugar checks to detect Type 2 diabetes early.
  • Maintain a healthy lifestyle — balanced diet and regular exercise.

Conclusion

GDM is a challenge that can be successfully managed through knowledge, proper diet, exercise, and medical support. Do not let this diagnosis frighten you — instead, use it as motivation to adopt a healthier lifestyle for yourself and your baby.