Sometimes the body doesn’t need more. It needs less.
One of the most useful tools I use in functional medicine is also one of the simplest: the elimination diet.
And despite what the name might suggest, the goal isn't to permanently remove a long list of foods, become afraid of eating, or spend the rest of your life avoiding everything you enjoy.
The elimination diet is a short-term clinical tool.
Think of it as clearing the slate.
For a few weeks, we temporarily remove some of the foods and substances most likely to contribute to inflammation, immune reactivity, digestive symptoms, or other individual symptoms. Then, rather than assuming those foods are “bad,” we systematically put them back.
The goal is information.
Because sometimes, food may be an obstacle to cure.
Why remove food at all?
Food is medicine—but food is also information.
Every time we eat, we're asking the digestive and immune systems to process, break down, absorb, and respond to what we've consumed. For most people, this happens quietly and efficiently.
But when the body is already dealing with a lot—digestive dysfunction, chronic stress, poor sleep, hormonal changes, environmental exposures, infections, inflammation, or other physiologic stressors—the overall load can become important.
And sometimes, the food we are eating is adding to that load.
This doesn't necessarily mean the food is inherently unhealthy.
It means that a food that is perfectly healthy for one person may be a problem for another person at a particular point in time.
IFM describes the comprehensive elimination diet as a short-term approach designed to identify potential food triggers, reduce inflammation, improve intestinal permeability, and support a healthy microbiome. The standard IFM approach uses a minimum three-week elimination phase followed by systematic reintroduction. (The Institute for Functional Medicine)
That distinction is important.
We're not asking, “What foods should everyone stop eating?”
We're asking:
“Could something I'm eating be making it harder for my body to do what it's trying to do?”
What actually gets eliminated?
The IFM Comprehensive Elimination Diet temporarily removes a number of common potential food triggers, including:
Alcohol
Beef
Chocolate
Corn
Dairy
Eggs
Gluten-containing grains
Peanuts
Pork
Processed meats
Shellfish
Soy
Refined sugar
Coffee and other caffeinated beverages
The intention isn't that these foods are universally inflammatory or unhealthy. Rather, they're removed temporarily because they are common components of the diet and may be relevant triggers for some individuals. (PubMed Central (PMC))
The diet also emphasizes what you can eat: nutrient-dense whole foods, vegetables, fruits, appropriate proteins, healthy fats, gluten-free whole grains, nuts and seeds, and plenty of variety.
So this isn't simply a diet of “don't eat this, don't eat that.”
It's an opportunity to shift the question from restriction to observation.
What about inflammation?
Inflammation isn't inherently bad.
It's one of the body's normal protective responses. The problem is when inflammatory signaling becomes persistent or disproportionate to the original trigger.
Food can be one piece of that puzzle.
Highly processed foods and diets high in refined sugar, for example, have been associated with inflammatory and metabolic health concerns, while diets emphasizing plants, healthy fats, whole grains, and other nutrient-dense foods are associated with better overall health outcomes. (The Institute for Functional Medicine)
And then there are individual reactions.
A person may notice that a particular food contributes to bloating, reflux, changes in bowel movements, headaches, congestion, skin symptoms, joint discomfort, fatigue, or other symptoms.
Sometimes the connection is obvious.
Sometimes it isn't.
And sometimes we're eating the same foods over and over again and simply don't have enough contrast to recognize the connection.
That's where an elimination diet can be incredibly useful.
Sometimes even “healthy” foods need a break
This is one of the most important concepts I try to explain to patients.
Healthy does not always mean therapeutic for you right now.
A food can be nutrient-dense and still be irritating to an individual's digestive or immune system.
This can be especially relevant when someone has impaired digestion or absorption.
If digestion is sluggish, if the gut is irritated, or if the intestinal immune system is particularly reactive, the body may respond differently to foods that were previously tolerated without issue.
And this is also where herbs and spices can become interesting.
I love herbs and spices. They're incredibly rich sources of phytonutrients and can absolutely be part of an anti-inflammatory, whole-food diet. (The Institute for Functional Medicine)
But during an elimination diet, we sometimes temporarily simplify those variables, too—particularly when someone's symptoms suggest that certain foods, botanicals, or concentrated ingredients may be contributing to irritation.
The point isn't that herbs and spices are “bad.”
The point is to reduce variables long enough to see the signal through the noise.
What about histamine?
Histamine is another example of why personalization matters.
Histamine is a normal chemical messenger involved in immune function, digestion, and other physiologic processes. Mast cells release histamine as part of immune responses, and some individuals may experience symptoms when their overall histamine load becomes difficult to manage. (The Institute for Functional Medicine)
For someone with suspected histamine intolerance or significant mast-cell-related symptoms, a practitioner may modify an elimination protocol to temporarily reduce higher-histamine foods.
But this is exactly why I don't recommend that everyone simply follow an extremely restrictive low-histamine diet.
Many nutritious foods contain histamine or can influence histamine pathways, and unnecessarily eliminating large numbers of foods can make an already restrictive diet even more restrictive. IFM clinicians similarly emphasize individualized approaches rather than assuming every patient needs a low-histamine diet. (The Institute for Functional Medicine)
Again: personalization over restriction.
The goal isn't to stay on the elimination diet
This is probably the most important part.
You don't “graduate” from the elimination diet by successfully avoiding everything.
You graduate by figuring out what you can tolerate.
After approximately three weeks, foods are systematically reintroduced—typically one at a time, while symptoms are monitored over the following 48–72 hours.
This is where the real detective work begins.
Maybe dairy is completely fine.
Maybe gluten isn't an issue.
Maybe eggs make no difference.
Maybe something you thought was causing a problem actually isn't.
Or maybe one particular food consistently brings back bloating, headaches, congestion, skin symptoms, fatigue, or changes in bowel function.
Now we have information.
And information is much more useful than fear.
The goal is ultimately to return to the most diverse diet your body tolerates well, rather than staying unnecessarily restricted. (PubMed Central (PMC))
So where does this fit into functional medicine?
This is where I think the elimination diet becomes especially powerful.
I don't necessarily use an elimination diet because I believe food is the entire problem.
In many cases, it isn't.
While we're simplifying the diet, we may also be investigating other pieces of the picture: digestion, nutrient status, microbiome health, hormones, blood sugar regulation, immune function, environmental exposures, sleep, stress, movement, and more.
We may be using targeted laboratory testing.
We may be supporting digestion.
We may be using nutrients, botanicals, or other therapeutic interventions.
We're working on multiple pieces of physiology at the same time.
The elimination diet is one pillar—not the whole house.
And sometimes reducing the dietary burden gives the body a little more room to respond to everything else we're doing.
“The body can heal.”
This is one of the ideas I come back to often with patients:
The body can heal.
But sometimes there are obstacles in the way.
From a naturopathic perspective, one of our jobs is to identify and remove those obstacles whenever possible.
Sometimes that obstacle is a nutrient deficiency.
Sometimes it's poor sleep.
Sometimes it's chronic stress.
Sometimes it's impaired digestion.
Sometimes it's an environmental exposure.
And sometimes, food is part of the obstacle.
That doesn't mean food is the enemy.
It means that, for a short period of time, we may want to make things a little quieter.
That's what I think of when I talk to patients about an elimination diet:
We're clearing the slate.
We're giving the digestive and immune systems a break from some of the most common potential triggers.
We're simplifying the picture.
We're watching what changes.
And then we're putting foods back in.
Because the ultimate goal isn't a smaller and smaller list of foods.
It's a body that can tolerate more, a diet that can become more diverse, and a patient who understands their own physiology better than they did before.
A short-term experiment, not a lifetime sentence
The evidence for elimination diets isn't a blanket statement that everyone should eliminate foods. The research is strongest when these diets are used as structured, time-limited, individualized interventions, particularly when followed by careful food reintroduction. IFM's own randomized controlled trial found that an IFM comprehensive elimination diet was associated with improved patient-reported health outcomes, while functional medicine health coaching significantly improved adherence to the diet. (The Institute for Functional Medicine)
And that's exactly how I like to think about it clinically.
We eliminate.
We observe.
We reintroduce.
We learn.
We personalize.
Sometimes, giving the body fewer obstacles is exactly what it needs to begin moving in the right direction.
An elimination diet should be individualized and ideally completed with guidance from a qualified healthcare professional, particularly for children, pregnancy, breastfeeding, individuals with significant medical conditions, or anyone with a history of disordered eating. Food allergies are different from food sensitivities and can require formal medical evaluation.