Yes — and the effect is large enough that "I ate clean and my glucose still spiked" is often a stress story, not a food story.
The mechanism
Stress triggers cortisol and adrenaline release. Both signal the liver to dump stored glucose into the bloodstream — a feature designed for fight-or-flight.
Acute stress
A bad meeting, an argument, a near-miss in traffic. Glucose can climb 20–60 mg/dL within 20 minutes, then settle within 1–2 hours.
Chronic stress
Months of work pressure or poor sleep elevate cortisol baseline. The result is consistently higher fasting glucose, weight gain around the midsection, and worsening insulin resistance.
What helps
### Daily - 5–10 minutes of meditation or box breathing - 10-minute walk outdoors - Cut caffeine after 2 PM - Magnesium glycinate at bedtime (300–400mg)
### Weekly - One workout that gets your heart rate to 70%+ max - Real social connection — phone calls beat texting - 7+ hours of sleep, 5+ nights/week
### Big-picture - Therapy if you're carrying anxiety - Boundaries at work - A hobby that requires hands and concentration
Track it
If your CGM shows unexplained spikes around the same time each day, mark stress journal entries against the graph. Patterns surface within a week.