Blood Sugar
Metabolic Health & Fertility

Blood Sugar
& Insulin Resistance

Insulin resistance is one of the most common and most modifiable drivers of hormonal imbalance, anovulation, and poor egg quality — yet it is frequently overlooked in fertility investigations.

80%
of PCOS cases involve insulin resistance
30–40%
glucose spike reduction from eating vegetables first
20–25%
insulin sensitivity reduction from one poor night's sleep
2–3×
higher anovulation risk with elevated fasting insulin
The Biology

How Insulin Resistance Impairs Fertility

  • →Insulin receptors are expressed on ovarian theca cells. Hyperinsulinaemia (chronically elevated insulin) directly stimulates theca cell androgen synthesis — increasing testosterone and androstenedione production independent of LH stimulation.
  • →Insulin also suppresses hepatic sex hormone-binding globulin (SHBG) synthesis. SHBG binds testosterone and oestradiol, rendering them biologically inactive. Lower SHBG means higher free androgen levels, worsening the androgenic environment in the ovary.
  • →Elevated free androgens impair follicular development by promoting follicular atresia (death) at the small antral stage, preventing dominant follicle selection and ovulation. This is the primary mechanism of anovulation in insulin-resistant PCOS.
  • →Normalising insulin sensitivity — through dietary modification, exercise, and targeted supplementation — reduces ovarian androgen production, increases SHBG, and restores ovulatory function in a significant proportion of women with PCOS-related anovulation.
Practical Strategies

6 Evidence-Based Food Strategies

🥦
Eat vegetables before grains
Viscous fibre from vegetables slows gastric emptying and glucose absorption, reducing postprandial glucose spike by 30–40%
🥚
Pair every carbohydrate with protein or fat
Protein and fat slow gastric emptying and stimulate GLP-1 release, blunting the insulin response to carbohydrates
🍎
Avoid fruit juice — eat whole fruit
Whole fruit contains fibre that slows fructose absorption; juice delivers fructose rapidly, driving hepatic de novo lipogenesis and insulin resistance
🌅
Eat breakfast within 1 hour of waking
Skipping breakfast elevates cortisol and impairs insulin sensitivity throughout the day; a protein-rich breakfast stabilises blood glucose for 4–6 hours
🚶
Walk 10–15 minutes after meals
Post-meal walking activates GLUT4 in skeletal muscle, clearing glucose from the bloodstream without requiring insulin — reducing the postprandial spike by up to 30%
🌾
Choose low-GI complex carbohydrates
Quinoa, sweet potato, legumes, and oats release glucose slowly; white bread, white rice, and ultra-processed foods cause rapid spikes
Blood Sugar & Insulin Resistance — Quick Reference
One-page PDF cheat sheet · Supplement doses, food priorities & action steps
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