The menstrual cycle affects half of people with type 1 diabetes monthly for decades — yet it’s nearly invisible in clinical guidelines, research literature, and algorithm design. Dr. Cecilia Nobili, a physician-researcher living with T1D, shares groundbreaking findings from her study of 170 women examining how different insulin delivery systems handle hormonal shifts across the menstrual cycle.
This episode reveals which AID systems maintain stability, where hypoglycemia risk spikes, practical strategies for each phase, and why this represents a genuine gender gap in diabetes care that industries and clinicians must address.
🔗 FULL SHOW NOTES & RESOURCES
https://theglucoseneverlies.com/menstrual-cycle-t1d/
TIMESTAMPS
00:00 Introduction
01:13 Welcome & Why This Episode Exists
03:29 Dr. Nobili’s Personal T1D Story
10:24 Menstrual Cycle 101: Phases, Hormones & Insulin
15:11 Understanding Progesterone & Insulin Resistance
17:08 The Perfect Storm: Luteal Phase Challenges
19:20 The Observational Study: 170 Women, 3 Centers
23:10 The Gender Gap in Diabetes Care
25:46 Unexpected Finding: Hypoglycemia as the Hidden Burden
28:10 How Different AID Systems Handle Cycle Changes
32:22 60% Deterioration on MDI vs 30-40% on AID
34:07 Control-IQ: The Most Stable System?
36:40 780G & Omnipod 5: The Hypoglycemia Risk
39:55 Practical Solutions by System
42:40 Next Steps: Structured Recommendations Study
45:06 Why This Should Be Built Into Algorithms
51:23 How to Connect & Support the Research
52:24 Closing Thoughts
KEY TAKEAWAYS
→ 60% of women on MDI experience ≥5% drop in time in range during the luteal phase
→ AID systems cut deterioration in half (30-40%) but aren’t perfect
→ Hypoglycemia when bleeding starts is often MORE burdensome than luteal phase highs
→ Control-IQ shows most stability across phases (observational data)
→ 780G & Omnipod 5 users should raise targets when bleeding starts to prevent hypos
→ CamAPS FX boost function is ideal for luteal phase (doesn’t “learn” the extra insulin)
→ Pre-bolusing 15-20 min before meals is critical during high insulin resistance
→ This is a GENDER GAP — menstrual cycles should be factored into algorithms
PRACTICAL STRATEGIES
FOR MDI:
• Increase basal 10-20% starting day 16-18
• Strengthen carb ratios (1:10 → 1:8)
• Reverse ALL changes when bleeding starts
FOR 780G / OMNIPOD 5:
• Raise glucose target when bleeding starts (3-4 days)
• OR lengthen active insulin time temporarily
FOR CAMAPS FX:
• Turn boost ON during mid/late luteal phase
• Turn boost OFF when bleeding starts
FOR CONTROL-IQ:
• May not need adjustments — monitor patterns
ALL SYSTEMS:
✓ Pre-bolus 15-20 minutes during luteal phase
✓ Mixed meals over high-GI foods
✓ Walk 10-15 min after eating
✓ Track cycle to anticipate changes
✓ One bad day is NOT catastrophic
ABOUT THE RESEARCH
Dr. Nobili’s multi-center observational study (170 participants across 3 Italian centers) is funded by a Breakthrough T1D research grant. This is the first comprehensive examination of how menstrual cycles impact glucose control across different insulin delivery modalities.
Next phase: Testing structured recommendations with follow-up to measure effectiveness and user adherence.
BOUT DR. CECILIA NOBILI
Pediatric Diabetology Resident, Turin, Italy
Living with Type 1 Diabetes
Breakthrough T1D Research Grant Recipient
Multi-center Researcher on Women’s Health & Diabetes
SPAD Science School Graduate
Interested in supporting this research or collaborating internationally? Reach out!
ABOUT THE GLUCOSE NEVER LIES PODCAST
Hosted by John Pemberton, diabetes educator and researcher living with T1D since 2008. Conversations with world-leading researchers and thought leaders, combining lived experience, professional expertise, and cutting-edge science.
⚠️ DISCLAIMER
This podcast is for informational purposes only and does not constitute medical advice. Always discuss any changes to your diabetes management with your healthcare team. Menstrual cycle patterns vary significantly — work with your team to identify your personal patterns.
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