Digest IT!

Health Disclaimer: I am not a medical professional. This post reflects my personal experience and should not be taken as medical advice. Always consult your doctor or gastroenterologist before starting an elimination diet.

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My gastroenterologist recommended an elimination diet for food sensitivities after months of unexplained bloating, unpredictable bathroom trips, and a general sense that my gut was working against me. I thought it would be two weeks of misery — plain chicken, steamed rice, and a lot of resentment. It turned into six weeks that genuinely changed how I understand my own digestion. Here is what happened, what I learned, and what I wish I had known before I started.

What an Elimination Diet Actually Involves (and Why It Is Harder Than It Sounds)

The version my doctor recommended was based on a protocol similar to the one described by the Institute for Functional Medicine — remove the most common dietary triggers for a set period, allow the gut to settle, then reintroduce foods one at a time and watch for reactions. The standard list of foods to eliminate typically includes gluten, dairy, eggs, soy, corn, peanuts, tree nuts, shellfish, alcohol, and added sugars. Some protocols also remove nightshades and legumes.

I removed all of those for the first three weeks. That sounds manageable until you start reading ingredient labels. Soy is in almost everything processed. Corn syrup hides in condiments, sauces, and packaged snacks. Dairy shows up in places you would never expect, like certain deli meats or flavored chips. I quickly realized that eating at home with whole, single-ingredient foods was the only reliable way to stay on track.

During the elimination phase, I also kept a detailed food and symptom journal. According to research published in the journal Gut, symptom tracking alongside dietary changes significantly improves a patient’s ability to identify true triggers compared to relying on memory alone. My journal became my most valuable tool — more on that in a moment.

The Reintroduction Phase: Where the Real Information Lives

Weeks four through six were the reintroduction phase, and this is where I started getting real answers. The protocol my doctor gave me involved reintroducing one food group every three days. You eat a reasonable serving of the reintroduced food, then go back to the elimination baseline and wait 72 hours before adding the next food group. The waiting period matters because delayed reactions — the kind associated with food sensitivities rather than true IgE-mediated allergies — can take anywhere from a few hours to three days to appear.

My reactions were not dramatic. There were no hives, no throat swelling, nothing that looked like a classic food allergy. Instead, reintroducing dairy brought back the bloating and loose stools I had been living with for years. Gluten caused a return of the brain fog and sluggishness I had not realized was food-related until it was gone. Eggs were fine. Soy was largely fine in whole forms like edamame, but less so in heavily processed forms. These distinctions — between whole and processed versions of the same food — were something I had not anticipated.

A note on dairy specifically: after confirming that dairy was a problem for me, I wanted to understand whether it was a lactose issue or a sensitivity to dairy proteins like casein. I experimented with lactase enzyme supplements before consuming small amounts of dairy. Products like Heivy Pure Lactase Enzyme 9000 FCC and Vitamatic Lactase Enzyme 9000 FCC 240 Tablets helped me tolerate dairy somewhat better, which suggested lactose was at least part of the problem. However, even with enzyme support, I still had some reaction — pointing to a sensitivity to dairy proteins as well.

For those dealing with broader digestive sensitivities beyond just lactose, I also tried Enzyme Science Intolerance Complex, 90 Capsules, which provides comprehensive enzyme support for gluten, casein, phenol sensitivities, and complex carbohydrates. It is not a license to eat foods you have confirmed as triggers, but it offers a layer of digestive support on days when complete avoidance is impractical. A smaller starter size, the Enzyme Science Intolerance Complex, 30 Capsules, is a good way to try it without committing to a large supply.

Should You Test Before or After an Elimination Diet?

This question came up early in my process. A few people in online IBS communities I follow suggested starting with an at-home food sensitivity test before diving into weeks of dietary restriction. There is a reasonable argument for that approach — having some preliminary data can help you prioritize which foods to focus on during reintroduction, or at least confirm that you are on the right track.

At-home sensitivity testing has improved considerably. The 5Strands Food Intolerance Test uses hair analysis to screen 658 items and returns results within four days, making it one of the more comprehensive and accessible options for adults and kids. Similarly, the AFIL 1000+ Foods, Drinks, Vitamins, Gut At-Home Wellness Test Kit covers an even broader range including vitamins and gut health indicators through non-invasive hair analysis.

If you prefer a blood-based approach, the Everlywell Food Sensitivity Test measures your body’s IgG antibody response to 96 different foods through CLIA-certified labs, providing a report that ranks your reactivity levels. It is worth noting that IgG testing is considered investigational by some medical organizations, but many people find it useful as a starting point for guiding their elimination protocol.

My honest opinion: these tests are useful as directional guides, not definitive diagnoses. The elimination and reintroduction method remains the clinical gold standard for identifying food sensitivities, but having test data alongside your symptom journal creates a more complete picture.

What Six Weeks of Food Journaling Taught Me About My Gut

Beyond the specific trigger foods I identified, the elimination diet handed me something I had not expected: a much clearer understanding of my baseline digestion. Before the protocol, I had normalized a lot of symptoms that were not actually normal. I assumed that feeling heavy and foggy after meals was just what eating felt like. I thought three or four bloating episodes a week was standard. It was not.

By the end of the elimination phase, I was having the best digestive function I could remember in years. That experience gave me a new reference point. When I reintroduced foods and felt those symptoms return, the contrast was impossible to ignore. I was no longer trying to remember whether I felt bad after eating something two days ago. I could feel the difference in real time.

A few practical things I learned along the way:

• Meal prep is not optional during the elimination phase. Without pre-cooked safe foods available, you will end up hungry and making exceptions.
• Eating out during elimination is genuinely difficult. Cross-contamination and hidden ingredients are real risks. I ate at home almost exclusively during weeks one through three.
• Symptoms during reintroduction can be subtle. Fatigue, mild headache, a slight change in digestion — these count. Do not wait for dramatic reactions before noting something in your journal.
• Stress and sleep affect gut symptoms independently. I had a particularly stressful week during reintroduction and could not reliably attribute my symptoms to food alone that week. I had to repeat one reintroduction phase.
• Working with a registered dietitian familiar with elimination protocols made a significant difference. Having someone review my journal entries helped me interpret ambiguous reactions.

For those who identify dairy as a confirmed sensitivity, NOW Foods Dairy Digest Complete, 90 Veg Capsules is worth having on hand. It contains a broad-spectrum blend of enzymes that help break down lactose, dairy proteins, and dairy fats — useful for situations where dairy avoidance is imperfect rather than as a daily workaround for a confirmed problem food.

My Final Recommendation After Doing an Elimination Diet for Food Sensitivities

If you have been living with unexplained digestive symptoms — bloating, irregular bowel habits, post-meal fatigue, or generalized gut discomfort — pursuing an elimination diet for food sensitivities under medical supervision is one of the most informative things you can do for your health. It is not comfortable, and it requires genuine commitment for the protocol to generate useful data. But the information it returns is specific to your body in a way that no general dietary advice can match.

Here is what I recommend based on my experience:

• Start with your doctor or gastroenterologist to rule out conditions like celiac disease or IBD before attributing symptoms to food sensitivities.
• Consider using an at-home test like the 5Strands Food Intolerance Test or the Everlywell Food Sensitivity Test to gather preliminary data before you begin.
• Keep a detailed food and symptom journal every single day — not just when you feel bad.
• If dairy comes up as a trigger, experiment with enzyme support like Heivy Pure Lactase Enzyme 9000 FCC to help distinguish between lactose intolerance and a broader dairy protein sensitivity.
• For broader multi-food sensitivities, keep a product like Enzyme Science Intolerance Complex in your toolkit for real-world eating situations.

Six weeks felt long when I started. Looking back, it was a small investment for years of eating with more clarity and far less discomfort. If your gut has been trying to tell you something, this protocol might finally give you the language to