Gestational diabetes is the most common metabolic disorder of pregnancy: 7 to 10% of pregnancies, and a frequency that climbs with maternal age and the prevalence of overweight. It appears late (often in the second trimester), almost never produces symptoms, and is detected by screening. The good news fits in one sentence: it is the diabetes most accessible to control through the plate, and early management changes the prognosis for mother and child.
A pregnancy-driven insulin resistance
Pregnancy produces a physiological resistance to insulin: placental hormones (hPL, progesterone, cortisol) make cells less sensitive so that glucose remains available to the fetus. This is a normal mechanism. Gestational diabetes arises when the maternal pancreas can no longer compensate for this resistance: blood sugar climbs, the fetus is exposed to excess glucose, and complications set in (macrosomia, prematurity, pre-eclampsia, caesarean section).
What distinguishes GDM from type 2 diabetes is its context: it is transient, most often disappears after delivery, and is triggered by pregnancy itself in a woman who had no disorder beforehand. But it is not trivial: it reveals a susceptibility that outlasts the pregnancy.
The O’Sullivan screen: who, when, how
Screening takes place between 24 and 28 weeks of gestation, by the O’Sullivan test: 75 g of glucose drunk fasting, then blood sugar measured at 1 and 2 hours. The diagnosis is made if fasting glucose exceeds 0.92 g/L (5.1 mmol/L), the 1-hour value exceeds 1.80 g/L (10 mmol/L), or the 2-hour value exceeds 1.53 g/L (8.5 mmol/L). Women at risk (overweight, family history of diabetes, age over 35, previous GDM or macrosomia) are screened from the first trimester.
The method is mildly unpleasant (the drink is very sweet) but reliable: it is the only pregnancy screen that detects a silent disorder with a documented intervention.
The glycaemic index as the first tool
The first lever in GDM is the glycaemic index: replacing fast carbohydrates with slow ones is enough to control blood sugar in the majority of cases. In practice: liquid sugars and refined products disappear (soft drinks, juices, white breads, sweetened cereals), whole grains and pulses take their place, and each meal pairs carbohydrate + protein + fibre to slow absorption.
Distribution matters as much as composition: three structured meals and one or two planned snacks avoid the breakfast spike (the moment when insulin resistance is strongest, and where sweetened cereals do the most damage). The GDM breakfast is often the first adjustment: fewer carbohydrates, more protein, no juice.
The postnatal period: the risk that remains
Delivery erases GDM in the majority of cases, but not the susceptibility. Women who have had GDM carry a multiplied risk of type 2 diabetes in the years that follow: postnatal follow-up (fasting glucose at 6-12 weeks, then annually) is the most neglected and most useful measure. Pregnancy revealed the terrain; the postnatal period decides whether it is maintained.
Breastfeeding is the best-documented lever of this protection: it improves the mother’s insulin sensitivity and reduces the later risk of T2D. Regular physical activity and weight normalisation complete the picture.
The TCM reading: the Spleen deficiency under surcharge
Chinese dietetics reads gestational diabetes as Spleen deficiency meeting a surcharge: pregnancy demands a production effort (Blood, Jing, the mother’s accomplishment) that draws on Spleen Qi. When the diet adds a load of fast sweet to an already committed Spleen, transformation fails: Dampness and Heat settle in, and the “turbid Blood” rises. It is the same reading as type 2 diabetes in TCM, with the terrain of pregnancy on top.
The TCM approach to GDM supports the Spleen without loading it: regular, cooked, warm meals; reduced fast sugars; sweet grains and pulses that tonify without congesting; all while respecting the contraindications of pregnancy (no restrictive dieting, no fasting, no herbs that mobilise Blood).
Frequently asked questions about gestational diabetes
Does GDM show in symptoms?
Almost never: it is silent. The classic signs (thirst, frequent urination, fatigue) are banal in pregnancy and do not allow diagnosis. Only the O’Sullivan screen reveals it; that is why it is routine between 24 and 28 weeks.
Does GDM disappear after delivery?
In the majority of cases, yes: pregnancy-driven insulin resistance resolves once the placenta is gone. But the risk of type 2 diabetes remains elevated for life; postnatal follow-up (glucose at 6-12 weeks, then annually) is the condition for detecting any persistence or return.
Can insulin be avoided in GDM?
Often, yes: an adapted diet (low glycaemic index, carbohydrate distribution, paired protein) controls blood sugar in 70 to 80% of cases. When it does not, insulin is the reference treatment: it does not cross the placenta and is not a failure. Metformin and glibenclamide are alternatives depending on the context.
Must a strict sugar-free diet be followed?
Not sugar-free, but low glycaemic index: slow carbohydrates (whole grains, pulses) stay, fast sugars go. Total deprivation is neither necessary nor desirable: it risks deficiencies and ketones that are not good for pregnancy. Control plays out on quality and distribution, not elimination.
The metabolic disorder that is managed, not endured
Gestational diabetes is the most common metabolic disorder of pregnancy and one of the best controlled: systematic screening, low glycaemic index, carbohydrate distribution, postnatal follow-up. Pregnancy revealed the terrain; the postnatal period decides whether it is maintained. The TCM reading adds its piece: a Spleen supported through pregnancy is a Spleen that still transforms.
In the Yin Shi app, the food sheets give the glycaemic index and the load of each product: pulses and whole grains tick the boxes of GDM to control, fast sugars those of what overwhelms the pregnant Spleen.
Further reading: the glycaemic index and the sweet flavour, insulin resistance as Spleen deficiency, prediabetes and remission, type 2 diabetes through the TCM lens, and pregnancy in Chinese dietetics.
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Yin Shi ecosystem resources directly related to this article.