Migraine and Blood Sugar: Why Skipped Meals Trigger Attacks: Why Skipped Meals Trigger Attacks
Skipped meals are one of the most consistently reported migraine triggers. What's known, what isn't, and what's worth trying.
Fasting and skipped meals appear on almost every list of migraine triggers, and unlike much of that literature, this one has reasonable support.
What's reasonably established
Skipped meals and fasting are common triggers. This is consistently reported across studies of migraine triggers and is one of the more reliable findings in a field full of weak ones.
Migraine and insulin resistance are associated. People with migraine show higher rates of insulin resistance than expected, and the relationship appears to run in both directions.
Glucose fluctuation is a plausible mechanism. The brain is highly dependent on steady glucose supply, and both drops and rapid swings are candidate triggers.
What's less established
Whether a low glycemic diet prevents migraine has limited direct trial evidence. There's more research on ketogenic diets for migraine, with some promising results, but that's a different and much more demanding intervention.
So the honest position: keeping blood sugar steady addresses a well-documented trigger. That's not the same as a treatment, and I wouldn't present it as one.
What's worth trying
Given the trigger evidence, the practical advice is unusually clear:
Don't skip meals. This is the specific, evidence-supported one. If you take nothing else, take this.
Eat at regular intervals rather than long gaps followed by large meals.
Protein at breakfast, which flattens the day's curve and reduces the dip that arrives mid-morning.
Carry something. If migraines follow delayed meals, having food available matters more than what the food is.
Watch caffeine consistency. Both excess and withdrawal are triggers, and irregular intake is worse than consistently high or consistently low.
Sleep regularity, which is at least as strong a trigger as food.
On elimination diets
You'll encounter long lists of trigger foods — aged cheese, chocolate, red wine, tyramine, MSG. The evidence for most is weak and largely based on self-report, which is vulnerable to recall bias.
Chocolate is the clearest example: several controlled studies failed to reproduce it as a trigger, and craving chocolate may be a symptom of the prodrome rather than a cause of the attack.
I'd be cautious about long elimination lists. They restrict a great deal on thin evidence, and restriction has its own costs.
Try this week: eat at regular intervals for a two weeks and keep a simple note of attacks. Meal timing is the variable most worth isolating.
Education, not medical advice. Migraine should be managed by your doctor — frequent attacks may warrant preventive treatment.