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Aches & Pains After Eating? 5 Signs It May Be An Undiagnosed Food Allergy

Last updated on February 20, 2020

If you experience unexplained chronic fatigue, joint aches, muscle pains, headaches, memory problems, or sleep disorders, it may be worth it to check what you're eating.

People are frequently diagnosed with chronic fatigue syndrome, fibromyalgia, autoimmune disorders like rheumatoid arthritis and multiple sclerosis, or a psychiatric disorder, such as anxiety or depression, typically because physicians are unable to find another cause for their symptoms.

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Can we do better? Patients who come to see me with chronic symptoms often have many potential overlapping medical issues contributing to their chronic illness. Some of the biggest culprits? Food allergies, food sensitivities and nutritional deficiencies. That said, your aches and pains could very well be caused by what you're eating.

How can eating the wrong foods make us sick?

Many of the symptoms that we see in conditions like Lyme disease are due to inflammatory molecules in the body, called cytokines, which are produced during the infectious process. These can cause fatigue, headaches, joint and muscle pain, mood swings, sleep problems and cognitive difficulties. These same molecules are also produced when we eat the wrong types of foods, and can contribute to resistant symptoms.

How to know if food is impacting your health.

If you're wondering whether your aches, pains, and fatigue after eating are due to food sensitivities or allergies, here are five important signs to keep in mind.

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Soon after eating a meal, you notice that you begin to yawn and feel tired.

It could happen minutes or hours after eating. This could be accompanied by feeling anxious, palpitations, shaking, feeling dizzy, feeling like you might pass out, or that you need a nap. This is often due to reactive hypoglycemia, which means that the blood sugars are swinging.

Solution: Eat small frequent meals, don’t skip meals, cut back on simple sugars and carbs, and eat a balanced diet with quality protein, complex carbohydrates and healthy fats (olive oil, coconut oil, avocados). A five-hour glucose tolerance test with insulin levels can also help determine if you have reactive hypoglycemia.


You suffer from chronic headaches and/or migraines.

You have headache pain upon awakening in the morning, several hours after a meal, or even a day after eating certain foods. This is often due to food sensitivities which act as migraine triggers, and/or trigger a hypoglycemic response.

Solution: Keep a food diary and write down everything you eat. Notice patterns of how certain foods affect you. Certain foods and additives are known migraine triggers (caffeine, chocolate, MSG, aged cheeses, for example). Sending off a food allergy profile can be helpful in determining which foods may adversely be affecting you1.

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You develop gas, bloating, episodes of belching, loose stools and/or diarrhea after eating.

Although there are many causes for these symptoms, this could be due to gluten sensitivity/celiac disease, food allergies/sensitivities, lactose and/or fructose intolerance, and/or SIBO (small intestinal bacterial overgrowth).

Solution: Keep a food diary, do an elimination diet, and see your health care provider and/or a gastroenterologist to get tested for these disorders. Occasionally a CDSA (comprehensive digestive stool analysis) through a laboratory specializing in nutritional medicine can help identify the cause of GI problems2.


You suffer from chronic constipation, despite eating a high fiber diet and drinking at least two liters of fluid per day.

This may be due to Lyme disease affecting the GI tract, food sensitivities and/or a lack of adequate magnesium in the diet.

Solution: Do a food allergy/sensitivity profile, try off grains such as wheat, and do a blood test for mineral deficiencies, including magnesium, with a serum and red blood cell (RBC) magnesium level. Often, getting off sensitive foods and increasing magnesium in the diet (500 mg to 1000 mg/day) will help with chronic constipation.

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You suffer from muscle and/or joint pain after eating meals.

This could be brief, intermittent pain, or a more sustained inflammatory response.

Solution: Do a food allergy/sensitivity test and stool analysis (CDSA test) to look for increased intestinal permeability (leaky gut), do an elimination diet and get tested for nutritional deficiencies, including zinc. (Zinc deficiency may increase inflammation in the body.) A trial off of nightshades (potatoes, tomatoes, eggplant, and peppers) may also be effective in a small proportion of individuals.Food is medicine, but eating the wrong types of foods along with nutritional deficiencies can make you sick.

If you're still unsure, it never hurts to see your health care provider and get tested for food allergies. The test may be what you need to finally receive answers for unexplained symptoms and chronic health problems.

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Richard Horowitz, M.D.
Richard Horowitz, M.D.
Board-certified physician

Richard Horowitz, M.D. is a board certified internist in private practice in Hyde Park, N.Y. He is medical director of the Hudson Valley Healing Arts Center, an integrative medical center which combines both classical and complementary approaches in the treatment of Lyme Disease and other tick-borne disorders. He has treated over 12,000 Chronic Lyme disease patients in the last 26 years, with patients coming from all over the US, Canada, and Europe to his clinic.

Richard has presented at numerous local, national, and international scientific conferences on Lyme Disease, and has published on the role of co-infections and toxins in Lyme Borreliosis. He was awarded the Humanitarian of the Year award by theTurn the Corner Foundation for his treatment of Lyme Disease, and has dedicated his life to helping those stricken with this devastating illness. He is also the author of the New York Times bestseller, Why Can’t I Get Better? Solving the Mystery of Lyme and Chronic Disease, released through St Martin’s press.