For most people, ordinary meals do not cause seizures. The foods and drinks with real evidence behind them make up a short list: alcohol and very large amounts of stimulant drinks lead it, followed by a handful of natural toxins, contaminated foods and parasites. Often what matters is not the food itself but how much is eaten and who eats it, since some foods are harmless to most people yet dangerous to someone with a specific health condition. Several popular fears, such as MSG and the sweetener in diet soda, have far weaker evidence than their reputation suggests.
Alcohol, Especially Stopping After Heavy Drinking
The brain runs on a balance between excitement signals and a calming signal. With prolonged heavy drinking, the brain dials down its GABA receivers and builds up excitement signals to make up for alcohol’s sedating effect.1PubMed Central. Alcohol withdrawal syndrome: mechanisms, manifestations, and management
When heavy drinking stops abruptly, the excitement signals run unopposed.2PubMed Central. Alcohol withdrawal syndrome: mechanisms, manifestations, and management Withdrawal can then bring shaking, a racing heart, confusion and seizures.3PubMed Central. Alcohol withdrawal syndrome: mechanisms, manifestations, and management Withdrawal seizures usually appear within about 6 to 48 hours of the last drink.
That is why quitting cold turkey is the risky moment. The danger peaks after drinking stops, not while someone is drinking, and people who drink heavily every day are at the most risk. Quitting under medical supervision lets doctors give medicines that prevent withdrawal seizures.
For people who already have epilepsy, binge drinking and the hangover period afterward can lower the seizure threshold, meaning how easily the brain tips into a seizure. Alcohol can also interact with seizure medicines and worsen drowsiness, and doses missed after a night out add to the risk. Ask your doctor what amount, if any, is safe for you.
Caffeine and Energy Drinks
Adults who drank large amounts of energy drinks have had repeated seizures with no other explanation. Once they stopped the drinks, the seizures did not return.4PubMed. New-onset seizures in adults: possible association with consumption of popular energy drinks These drinks pack caffeine together with taurine and guarana, which is itself a caffeine source.5PubMed. New-onset seizures in adults: possible association with consumption of popular energy drinks The evidence comes from a small number of cases, so it shows a possible link rather than a common risk.6PubMed. New-onset seizures in adults: possible association with consumption of popular energy drinks
About 400 mg of caffeine a day is the usual safe upper limit for healthy adults. Several energy drinks plus coffee can pass that quickly, and guarana and some supplements add caffeine you may not count. Sleep loss from late-day caffeine is itself a common seizure trigger, so the timing matters as well as the total.
An ordinary cup or two of coffee is not shown to cause seizures. People with epilepsy may notice their own sensitivity and can track it. If you decide to cut back, doing it gradually avoids withdrawal headaches.
What the Evidence Says About MSG and Aspartame
MSG adds glutamate, a natural excitement signal in the brain.7PubMed. The Role of Monosodium Glutamate (MSG) in Epilepsy and other Neurodegenerative Diseases: Phytochemical-based Therapeutic Approaches and Mechanisms In theory, too much glutamate could overexcite nerve cells and tip the brain toward seizures.8PubMed. The Role of Monosodium Glutamate (MSG) in Epilepsy and other Neurodegenerative Diseases: Phytochemical-based Therapeutic Approaches and Mechanisms But much of the evidence comes from injecting MSG under the skin of newborn rats.9PubMed. Monosodium glutamate neonatal treatment as a seizure and excitotoxic model Those experiments say little about eating MSG in a normal meal.
Glutamate occurs naturally in tomatoes, cheese and broth, and the gut processes eaten glutamate before much reaches the bloodstream. Injected doses in newborn animals bypass those defenses. A person who notices a pattern after certain meals can still choose to avoid them.
Aspartame, the sweetener in many diet drinks, has been suggested to lower the brain’s protective chemicals at high doses.10Los Angeles Times. Link Between Aspartame, Epilepsy Suggested The changes tied to seizures were seen in lab animals.11Los Angeles Times. Link Between Aspartame, Epilepsy Suggested People with phenylketonuria, a rare genetic condition, must avoid aspartame, as labels warn. For everyone else, normal diet-soda amounts are considered safe by food regulators.
Star Fruit and Kidney Disease
Star fruit contains nerve toxins that often cause serious nerve problems in people with chronic kidney disease.12PubMed. Status epilepticus induced by star fruit intoxication in patients with chronic renal disease People with kidney failure, even before needing dialysis, have developed nonstop seizures after eating it.13PubMed. Status epilepticus induced by star fruit intoxication in patients with chronic renal disease Anyone with kidney disease should avoid star fruit and its juice entirely.
Hiccups, vomiting and confusion can come before the seizures, and symptoms can start within hours. This needs emergency care, often including dialysis. Because people may not know their kidneys are weak, older adults with diabetes or high blood pressure should be cautious too.
Gluten and Celiac Disease
Between about 1 and 6 in 100 people with epilepsy also have celiac disease.14PubMed Central. Neurologic and Psychiatric Manifestations of Celiac Disease and Gluten Sensitivity A rare pattern combines celiac disease, epilepsy and calcium deposits at the back of the brain.15PubMed Central. Gluten sensitivity and epilepsy: a systematic review Seizures in that syndrome are often hard to control with medicine.16PubMed Central. Gluten sensitivity and epilepsy: a systematic review
Gut symptoms, poor growth or anemia alongside epilepsy are reasons to ask about testing. It is a simple blood test, done while you are still eating gluten. A gluten-free diet only helps people who actually have celiac disease, so get tested before cutting out gluten.
Natural Toxins in Seeds, Mushrooms and Shellfish
Ginkgo seeds, often roasted as a snack in East Asia, contain a toxin that mimics vitamin B6.17PubMed Central. Epileptic Seizure from Ginkgo Nut Intoxication in an Adult The brain needs vitamin B6 to make its calming signal.18PubMed Central. Ginkgotoxin Induced Seizure Caused by Vitamin B6 Deficiency So the toxin cuts that signal and can cause vomiting and seizures.19PubMed Central. Epileptic Seizure from Ginkgo Nut Intoxication in an Adult A 2-year-old had repeated convulsions after eating 20 to 30 ginkgo seeds.20PubMed. Concentrations of various forms of vitamin B(6) in ginkgo seed poisoning
Children are the most vulnerable, so they should be given few or none, and adults who enjoy the seeds should eat only a few at a time. Cooking does not fully remove the toxin. Doctors treat this poisoning with vitamin B6.
False morel mushrooms contain a toxin that also blocks vitamin B6 and drops the calming signal.21Maimonides Emergency Medicine Residency. POTD: Gyromitra – The seizure causing mushroom. False morels have wrinkled, brain-like caps, while true morels are hollow inside when cut lengthwise. Never eat wild mushrooms without expert identification.
Shellfish can carry domoic acid, a toxin made by tiny algae.22PubMed Central. Domoic Acid: Neurobehavioral Consequences of Exposure to a Prevalent Marine Biotoxin It overexcites the brain and can cause seizures and memory loss.23PubMed Central. Domoic Acid: Neurobehavioral Consequences of Exposure to a Prevalent Marine Biotoxin
Cooking or freezing does not destroy this toxin. If you harvest your own shellfish, check local advisories first. Store-bought shellfish is tested in many countries.
Contaminated and Spoiled Food
In one outbreak, people had seizures after eating snack food contaminated with a banned pesticide.24PubMed Central. Seizures after eating a snack food contaminated with the pesticide endrin. The tale of the toxic taquitos. Mold on spoiled coconut water or sugar cane can make a toxin that starves brain cells of energy.25PubMed Central. Fatal 3-Nitropropionic Acid Poisoning after Consuming Coconut Water In one case this caused fatal brain damage.26PubMed Central. Fatal 3-Nitropropionic Acid Poisoning after Consuming Coconut Water
These events are very rare in regulated food supplies. Still, don’t drink coconut water from a coconut that smells or tastes off, and refrigerate opened coconuts. If several people get sick after the same food, report it to health authorities.
Black Licorice and Blood Pressure
Real licorice contains glycyrrhizic acid, which makes the body hold salt and lose potassium.27Spartan Medical Research Journal. Licorice-Induced Pseudohyperaldosteronism Presenting as Seizure with Posterior Reversible Encephalopathy Syndrome: A Case Report Blood pressure can then climb dangerously high.28PubMed Central. Licorice consumption as a cause of posterior reversible encephalopathy syndrome: a case report Very high pressure can cause brain swelling that leads to seizures.29Spartan Medical Research Journal. Licorice-Induced Pseudohyperaldosteronism Presenting as Seizure with Posterior Reversible Encephalopathy Syndrome: A Case Report
It takes regular use. A 10-year-old had a cluster of seizures after eating licorice toffees daily for 4 months.30PubMed. Posterior reversible encephalopathy syndrome associated with licorice consumption: a case report in a 10-year-old boy The cause is easy to treat once licorice is stopped.31PubMed Central. Licorice consumption as a cause of posterior reversible encephalopathy syndrome: a case report
Red licorice usually contains no licorice root. The ingredient turns up in black licorice, some teas, herbal supplements and candies made with licorice extract, and labels may list it as glycyrrhizin or licorice root. People with high blood pressure or heart disease should be most cautious.
Headache, vision changes and confusion can come before a seizure, and muscle weakness can signal low potassium. If your blood pressure is unexplained, tell your doctors about any licorice habit.
Too Much Water
When blood sodium falls fast, brain cells swell.32Mayo Clinic. Hyponatremia Symptoms and causes Seizures usually come when sodium drops quickly below 115, against a normal of about 135 to 145.33PubMed Central. Acute Symptomatic Seizures Caused by Electrolyte Disturbances Severe swelling can lead to coma and death.34Mayo Clinic. Hyponatremia Symptoms and causes Two infants had seizures after drinking bottled water sold for babies.35PubMed Central. Acute Symptomatic Seizures Caused by Electrolyte Disturbances
Babies given plain water instead of formula or breast milk are at risk, as are endurance athletes who drink far beyond thirst and people in water-drinking contests. Some medicines and party drugs increase the risk too.
Babies under 6 months generally need no plain water. During exercise, drink to thirst, and on long events sports drinks with salt help. Confusion and headache after drinking large amounts of water need urgent care.
Tapeworm From Undercooked Pork
Tapeworm cysts in the brain are one of the most common preventable causes of epilepsy worldwide.36PubMed. Neurocysticercosis as an infectious acquired epilepsy worldwide People swallow pork tapeworm eggs in contaminated food or water, or through poor hygiene.37World Health Organization. Neurocysticercosis is a preventable parasitic infection The larvae then travel and settle in the brain.38PubMed. Taenia solium Neurocysticercosis
Wash your hands after using the toilet and before preparing food, drink safe water when traveling, and cook pork thoroughly, which prevents intestinal tapeworm infection. The eggs come from people carrying the adult worm, so even vegetarians can be exposed.
A first seizure in someone who lived in or traveled to Latin America, Africa or Asia is a reason to suspect it. Brain scans can show cysts, and treatment exists, so mention your travel history to your doctor.
Severe Allergic Reactions
Seizures are uncommon in severe allergic reactions.39PubMed Central. An unusual case of infant seizures with anaphylaxis to wheat When they happen, blood pressure usually crashes and the brain lacks oxygen.40PubMed Central. Clinical manifestations of immunoglobulin E–mediated food allergy, including pollen–food allergy syndrome The response is to treat the allergic reaction with epinephrine and call emergency services.
Hives, swelling and trouble breathing typically come first. Fainting can resemble a seizure, so if signs of a severe allergic reaction are present, use an epinephrine auto-injector right away rather than waiting to sort out which it is.
Household Oils Children Swallow
Swallowed eucalyptus oil, camphor oil and chest rubs have caused seizures in young children.41PubMed Central. Unintentional exposure of young children to camphor and eucalyptus oils Vomiting and drowsiness are more common symptoms.42PubMed Central. Unintentional exposure of young children to camphor and eucalyptus oils
Store chest rubs and essential oils out of reach. Small amounts can matter in toddlers. Call poison control right away after any swallow.
What to Do If You Think Food Caused a Seizure
Call emergency services for a first seizure or one lasting over 5 minutes. Keep leftovers and packaging, because in the pesticide outbreak, testing leftovers pointed to the cause.43PubMed Central. Seizures after eating a snack food contaminated with the pesticide endrin. The tale of the toxic taquitos.
Tell the doctor everything eaten and drunk in the past 24 hours, your alcohol habits and any recent changes, and any kidney disease or other conditions. Include supplements, teas and herbal products.
A trigger diary helps over the longer term. Note meals, sleep, stress and alcohol. Bring the diary to appointments.
Can a Diet Help Prevent Seizures
The ketogenic diet, very high in fat and very low in carbohydrate, is used to treat epilepsy. It shifts the brain from sugar to fat-based fuel.44PubMed. The mechanisms mediating the antiepileptic effects of the ketogenic diet, and potential opportunities for improvement with metabolism-altering drugs It also boosts the brain’s energy and its calming signal.45PubMed Central. Ketogenic Diet and Epilepsy The brain becomes harder to tip into a seizure.46PubMed Central. Ketogenic Diet and Epilepsy
It is mainly used when medicines haven’t worked. It should be done with a doctor and dietitian, since side effects include constipation and kidney stones. Don’t stop seizure medicines on your own.