Can Glutamate Restricted Diet Fight Migraines in Veterans?

Veterans with gulf war illness saw remarkable 80% reduction in migraine symptoms after one-month low glutamate diet.

Diet with low amount of glutamate could considerably decrease the cortical thickness in brain structure, leading to migraine relief and low chronic pain symptoms in veterans with gulf war illness (GWI).

The key finding was revealed by researchers from Georgetown University and American University and presented in Neuroscience meeting 2025. Researchers observed that these measurable physical changes in brain caused by restricted glutamate intake, are directly linked to chronic fatigue.(1^✔ ✔Trusted Source
Low-Glutamate Diet Linked to Brain Changes and Migraine Relief in Veterans with Gulf War Illness

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Glutamate, a flavor enhancing compound, present in processed foods may create excitotoxicity in nerves, causing migraine and other chronic pain. The low glutamate dietary option can be a better solution for migraine-suffering GWI veterans.

Understanding the Chronic Effects of Gulf War Illness

“This was exciting, because it shows that the brain itself is responding and changing,” said the study’s senior author Ashley VanMeter, PhD, professor of neurology at Georgetown University School of Medicine.

“This isn’t a psychological reaction. These are actual changes in the brain related to the diet.”

Gulf War Illness is a chronic condition affecting more than a quarter of veterans who served in the first Gulf War. It can cause an array of debilitating musculoskeletal, gastrointestinal, and neurologic symptoms, including migraines, and is thought to be caused by exposure to neurotoxic chemicals during the war.

Glutamate, which is found in high levels in processed foods and also occurs naturally in some foods like tomatoes and mushrooms, is the most abundant excitatory neurotransmitter in the nervous system, where it is known to play a role in mediating pain.

Comparing GWI Symptoms to Healthy Individuals

The low-glutamate diet is currently being studied in a large multi-site clinical trial to confirm these findings in patients with Gulf War Illness.

“This was an exciting opportunity to see if we can do something for these veterans who have literally been suffering since the 1990s,” VanMeter said.

For the study, researchers first used brain scans to compare differences in cortical thickness between patients with Gulf War Illness and a group of healthy patients. Those with Gulf War Illness had a significantly thicker right visual cortex.

This group was also significantly more likely to report experiencing migraines than the healthy group.

80% Drop in Migraines Confirmed by Low Glutamate Diet

Then in a follow-up study, researchers had patients with Gulf War Illness follow a low-glutamate diet. After a month, scans showed that cortical thickness in this group was significantly reduced.

Researchers also observed a “big, big decrease” in migraines and headaches, VanMeter noted.

“More than half of the Gulf War veterans had migraines before the diet, and that dropped to under 20% after following the diet for one month,” she said. “So, it was a very significant drop.”

Holton said the findings support the team’s theory that glutamate may be contributing to the symptoms of Gulf War Illness by driving excitotoxicity, neuroinflammation, and oxidative stress in the brain; and that these three processes then continue to trigger each other in an ongoing cycle.

“We think this is one of the reasons people who are susceptible to dietary glutamate tend to have prolonged symptoms over time,” she explained. The researchers noted that other symptoms also improved in the low-glutamate group, including significant reductions in widespread pain, fatigue, mood issues, and cognitive dysfunction.

The team plans to publish additional findings from their current ongoing study.

Diet as Acute Treatment for Chronic Symptoms

While not universal, thickening of the visual cortex, part of the brain linked to vision, is common among migraine sufferers, especially those whose migraines occur with aura, or visual disturbances.

That raises the question of whether a low-glutamate diet could also benefit the wider population of migraine sufferers, potentially even as an alternative to medication, VanMeter said. “This is a very doable diet,” she said. “It’s a healthy diet, it’s not that hard to follow, and it’s a very low-cost way of treating what for some individuals is a chronic and debilitating condition.”

Holton noted that the study also adds to a growing body of evidence about how ultra-processed foods impact health.

“This speaks to the fact that diet can not only make us sick, but can also acutely treat our symptoms,” she said.

Follow-up research is underway to expand on the findings and investigate if weakening of the blood-brain barrier plays a role in glutamate sensitivity.

Reference:

1. Low-Glutamate Diet Linked to Brain Changes and Migraine Relief in Veterans with Gulf War Illness – (https://medicine.georgetown.edu/news-releases/low-glutamate-diet-linked-to-brain-changes-and-migraine-relief-in-veterans-with-gulf-war-illness/#:~:text=For%20the%20study%2C%20researchers%20first,over%20time%2C%E2%80%9D%20she%20explained.)

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