Blood Sugar in Pregnancy: What You Need to Know

Estimated Read Time:  7-8 minutes

What is insulin resistance and why does it happen in pregnancy?

Insulin is the hormone produced by your pancreas that helps your cells absorb glucose (sugar) from the bloodstream and use it for energy. When your cells respond less efficiently to insulin meaning they require more of it to do the same job this is called insulin resistance.

In pregnancy, a degree of insulin resistance is completely normal. It's driven by hormones produced by the placenta - primarily human placental lactogen (hPL), along with rising oestrogen and cortisol which deliberately blunt your body's insulin response.

The result is that more glucose stays in your bloodstream for longer, making it available for your baby to draw on across the placenta. From a physiological standpoint, it's a remarkably clever adaptation.

The challenge is that modern diets high in refined carbohydrates, processed foods and added sugar can push this natural insulin resistance well beyond what your body can comfortably compensate for. When that happens, blood sugar in pregnancy spikes and crashes become more pronounced, cravings intensify, and the long-term risk of gestational diabetes increases.

1 in 6 Australian pregnancies are now affected by gestational diabetes, a rate that has more than doubled in the past two decades. For every woman diagnosed, many more are experiencing subclinical blood sugar dysregulation that affects how they feel every day.

When does insulin resistance peak in pregnancy?

Insulin resistance increases progressively through pregnancy, driven by rising placental hormone levels. It is typically most pronounced in the second and third trimesters, which is why gestational diabetes screening occurs between weeks 24 and 28.

However, blood sugar sensitivity can begin shifting from as early as the first trimester — particularly in women who already have some degree of insulin resistance prior to pregnancy, including many women with PCOS, a history of gestational diabetes, or a family history of type 2 diabetes.

This is why blood sugar management is not just a third trimester concern, it's a whole-pregnancy consideration.

Signs your blood sugar might be dysregulated

Blood sugar dysregulation exists on a spectrum. You don't need a gestational diabetes diagnosis to be experiencing its effects. These are the everyday signs that many pregnant women experience but rarely connect to blood sugar:

• Energy crashes one to two hours after eating
• Intense cravings for sugar, refined carbohydrates, or sweet foods
• Feeling hungry again very soon after finishing a meal
• Nausea that improves when you eat but returns quickly, particularly in the first trimester
• Waking in the night hungry or unsettled
• Feeling shaky, lightheaded, or irritable between meals
• Fatigue that isn't proportional to how much sleep you're getting
• Mood swings that seem to follow eating patterns

If several of these resonate, your blood sugar patterns are worth paying attention to regardless of what your GD screening result says.

Why blood sugar balance matters for your baby, not just for you

The effects of blood sugar dysregulation in pregnancy extend beyond how you feel. They directly affect your baby's development and long-term health outcomes.

• Fetal macrosomia: When blood glucose levels are consistently elevated, your baby is exposed to more glucose than it needs. The excess is stored as fat, which can lead to a larger than average baby, a condition called macrosomia. This increases the risk of complications during birth and a higher rate of caesarean delivery.
• Your baby's future metabolic health: Research increasingly shows that the intrauterine environment, including the glucose levels a baby is exposed to in the womb influences their metabolic health outcomes decades later. Babies exposed to elevated blood glucose have a higher risk of developing insulin resistance, obesity, and type 2 diabetes in adulthood.
• Placental function: The placenta is extraordinarily metabolically active. Sustained blood sugar spikes impair placental blood flow and nutrient transfer, affecting how efficiently oxygen and nutrients reach your baby.

The role of protein in blood sugar management during pregnancy

Protein is the single most effective dietary tool for blood sugar management in pregnancy. It slows gastric emptying, blunts post meal glucose spikes, supports sustained satiety, and reduces the frequency and intensity of sugar cravings.

Most pregnant women are not eating enough protein and this gap widens in the first trimester when appetite is suppressed and food aversions are common.

High protein foods to prioritise throughout pregnancy:

• Eggs: 6g per egg, plus choline, B12, and iron
• Greek yoghurt: 15-20g per cup, plus calcium and probiotics
• Chicken, beef, lamb, salmon: 25-30g per serve
• Legumes (lentils, chickpeas, edamame): 15-18g per cup
• Cottage cheese: 14g per half cup, easy to digest
• Hydrolysed collagen: easy to stir into smoothies, water, or yoghurt
• Nuts and nut butters: 5-8g per serve, plus healthy fats
• Tofu and tempeh: 10-20g per serve (great for plant-based pregnancies)

A practical rule worth building into every meal: never eat carbohydrates alone. Pair all carbohydrate-containing foods with a source of protein, fat, or fibre. Fruit with nut butter. Toast with eggs. Rice with chicken and vegetables. The combination significantly slows glucose absorption and flattens post-meal blood sugar spikes.

Myo-Inositol and blood sugar in pregnancy, what the research shows

Myo-Inositol is a naturally occurring compound found in small amounts in foods like citrus fruits, beans, and wholegrains. It plays a direct role in insulin signalling, essentially acting as a messenger that helps your cells respond to insulin more efficiently.

A growing body of clinical research has demonstrated that Myo-Inositol supplementation significantly improves insulin sensitivity, reduces fasting blood glucose levels, and lowers the incidence of gestational diabetes, particularly in women who are already at elevated risk.

What the clinical evidence shows:

• A 2012 randomised controlled trial found that Myo-Inositol supplementation reduced gestational diabetes incidence by over 60% in high-risk women
• Multiple studies demonstrate improved insulin sensitivity and reduced fasting glucose in women with PCOS, a condition defined in part by insulin resistance
• Research shows Myo-Inositol reduces fasting insulin levels and improves glucose tolerance across pregnancy
• It has also been associated with reduced risk of neural tube defects when used alongside folate

Myo-Inositol is particularly well studied in the context of PCOS, where insulin resistance is often a central driver. Given that PCOS affects an estimated 1 in 10 women of reproductive age in Australia, the relevance of this research to pregnancy nutrition is significant.

The clinically studied dose is 2-4g per day, typically taken in two divided doses with meals.

Practical habits that support blood sugar balance throughout pregnancy

Supplementation works best alongside supportive lifestyle habits. These are the most evidence informed strategies for blood sugar management during pregnancy:

• Eat within an hour of waking: Blood sugar drops overnight and reaches its lowest point first thing in the morning. Eating breakfast with protein, within 30-60 minutes of waking stabilises blood sugar early and sets the tone for the rest of the day. This also significantly reduces first-trimester nausea, which worsens when blood sugar is low.
• Eat smaller meals more frequently: Large meals, particularly carbohydrate heavy ones create large blood sugar spikes followed by significant crashes. Smaller, more frequent meals every 3-4 hours keep blood sugar more stable and reduce the intensity of cravings and energy dips.
• Walk after meals: Even a 10-15 minute walk after eating significantly improves post-meal glucose clearance. Muscle contractions during movement allow glucose to be taken up by muscles without requiring insulin, one of the most effective and accessible blood sugar management tools available.
• Prioritise sleep: Poor sleep directly impairs insulin sensitivity, even a single night of disrupted sleep can meaningfully affect your glucose response the following day. While perfect sleep in pregnancy is often elusive, supporting sleep quality through magnesium supplementation, a consistent sleep routine, and comfortable sleep positioning is worth prioritising.
• Stay well hydrated: Dehydration impairs glucose regulation and concentrates blood glucose levels. Adequate hydration, at least 2-2.5 litres per day in pregnancy, more in hot weather or during exercise supports healthy kidney function and glucose clearance.
• Choose lower-GI carbohydrate sources: Not all carbohydrates affect blood sugar equally. Lower GI options - oats, sourdough, legumes, sweet potato, brown rice — release glucose more slowly and produce smaller, more manageable blood sugar spikes compared to their high GI equivalents.

The Blood Sugar Bundle: Myo-Inositol and Collagen, designed to work together

We formulated the Blood Sugar Bundle because Myo-Inositol and Hydrolysed Collagen work synergistically in ways that go beyond blood sugar alone.

• Myo-Inositol directly supports insulin signalling at the cellular level, improving how your body responds to glucose. It's pharmaceutical-grade, unflavoured, and dissolves easily into any liquid.
• Hydrolysed Collagen provides a high-quality, easily absorbed protein source that stabilises blood sugar, supports sustained satiety, and delivers the amino acids your body needs for skin elasticity, pelvic floor integrity, joint support, and postpartum recovery.

Together, they give you a simple daily routine, mix both into water, a smoothie, or yoghurt that supports blood sugar balance, protein intake, and overall pregnancy nutrition in one step.

→Shop the Blood Sugar Bundle 

→ Shop Myo-Inositol

→ Shop Hydrolysed Collagen 

What if I've already been diagnosed with gestational diabetes?

A gestational diabetes diagnosis is not a failure, it's information. It means your body's insulin response has been pushed beyond what it can compensate for, and it needs additional support.

The same strategies covered in this article apply, protein at every meal, lower-GI carbohydrates, Myo-Inositol supplementation, post-meal movement, and hydration and often produce meaningful improvements in blood glucose management alongside any medical treatment your care team recommends.

Frequently Asked Questions About Blood Sugar in Pregnancy

Does blood sugar affect all pregnant women, not just those with gestational diabetes? Yes. A degree of insulin resistance is a normal part of every pregnancy, driven by placental hormones. The difference is how pronounced it becomes and how much it affects your daily symptoms and your baby's development. Managing blood sugar in pregnancy is relevant to every woman, not just those with a formal diagnosis.

What are the signs of blood sugar dysregulation in pregnancy? Common signs include energy crashes after meals, intense sugar cravings, waking in the night hungry, nausea that improves briefly after eating, persistent fatigue, and mood swings that follow eating patterns. These symptoms are often dismissed as normal pregnancy experiences but they frequently have a blood sugar component.

Can Myo-Inositol help with blood sugar in pregnancy? Yes, Myo-Inositol has strong clinical evidence supporting its role in improving insulin sensitivity and reducing the incidence of gestational diabetes, particularly in high-risk women. The clinically studied dose is 2-4g per day in divided doses. Always discuss supplementation with your midwife or GP before starting.

How does protein help manage blood sugar during pregnancy? Protein slows the rate at which glucose enters your bloodstream after eating, blunting post-meal spikes and keeping blood sugar more stable between meals. Pairing every carbohydrate with protein, fat, or fibre is one of the most effective dietary strategies for blood sugar management in pregnancy.

When does insulin resistance peak in pregnancy? Insulin resistance is typically most pronounced in the second and third trimesters, which is why gestational diabetes screening happens at weeks 24-28. However, blood sugar sensitivity can shift from as early as the first trimester in women with pre-existing insulin resistance, PCOS, or a family history of type 2 diabetes.

Is walking after meals actually effective for blood sugar in pregnancy? Yes, even a short 10-15 minute walk after eating is one of the most evidence-supported tools for improving post-meal glucose clearance. Movement allows muscles to absorb glucose directly without requiring insulin, making it particularly effective and accessible during pregnancy.