Why I avoid restrictive diets (and what food intolerances may be telling you)

Most people don’t set out intending to follow a restrictive diet. It often starts with a genuine attempt to feel better. You remove gluten because you’ve heard it might help bloating. You reduce dairy because sometimes it upsets your tummy. You try low FODMAP after weeks of cramping and discomfort. Your symptoms improve, at least temporarily, and the change feels justified.

Over time, another food seems to cause a reaction. Then another. The list of safe foods gets shorter and shorter. Eating becomes more strategic and more cautious. Social events require preparation, restaurants feel impossible. You begin to rely on only a small group of “safe” foods.

This pattern is incredibly common. It also deserves careful reflection.

Restriction can feel helpful — at first

There are situations where dietary restriction is appropriate and evidence-based. The low FODMAP diet, for example, can significantly reduce symptoms in people with irritable bowel syndrome. Used correctly, it is designed as a short-term intervention, typically around six weeks, followed by structured reintroduction.

Even the researchers at Monash University, who developed the protocol, are clear that the elimination phase is not intended to be long term. It is a therapeutic tool, not a lifestyle.

Restricting foods in your diet can provide relief. But relief is not the same thing as resolution.

True medical conditions are different

I want to pause for a moment and acknowledge there are important exceptions we need to consider when discussing food restrictions.

IgE-mediated food allergies can be severe and require strict avoidance. Coeliac disease requires lifelong gluten exclusion. These conditions and several others are not negotiable when it comes to food restrictions and must be diagnosed and managed appropriately.

But many people who accumulate long lists of intolerances are not dealing with these diagnoses. They are experiencing symptoms driven by gut dysfunction rather than immune-mediated allergy. The response in those cases is different.

What happens when the diet keeps narrowing

My concern arises when a person's list of tolerated foods becomes progressively smaller. Every time a food is removed, you are not only eliminating a potential trigger. You are also removing nutrients, fibres, and bioactive compounds that support the gut lining and the microbiome. Dietary diversity is strongly associated with microbial diversity, and a more diverse microbiome is linked to greater resilience and metabolic health.

When the diet becomes narrow for extended periods, microbial diversity often declines. This can make the gut more sensitive over time rather than less as you are producing fewer of the compounds needed to avoid 'leaky gut'. Reduced diversity also tends to correlate with higher numbers of inflammatory bacteria, increasing inflammation not just in the gut but in the rest of the body too.

In other words, the very strategy that once reduced symptoms may gradually reduce tolerance for other foods, whilst also setting the stage for higher levels of inflammation.

The emotional cost of constant restriction

Beyond physiology, there is a relational cost. Food becomes something to manage rather than enjoy. Invitations to spend time with friends and loved ones feel stressful when meals are involved. Travel feels out of the question. You spend a lot of your time focusing on what and how you eat in a way that starts to take over your life. This isn’t a moral failing. It is often the natural consequence of trying to gain control over your body and symptoms when they seem to be getting worse and worse.

Health should expand your life, not contract it, so if you feel like this is happening to you, it's important to reach out for professional guidance.

A note on dietary ideologies

I am not a strong advocate of rigid dietary frameworks such as keto, carnivore, vegan, paleo or others when they are adopted as blanket long-term eating styles.

These approaches can be useful in specific contexts or for short periods. But when a diet becomes an identity or a rigid system that excludes large food groups indefinitely, it can create unintended consequences, nutritionally, metabolically, and psychologically.

While I respect a person's choice to choose an eating style that aligns with their personal beliefs, my goal in clinical practice is always to improve wellbeing, so my clients can achieve their health goals. In my experience, this rarely involves long term strict adherence to a named diet. Restoring resilience and flexibility is key.

When food intolerance is a signal

If you notice that you are reacting to more foods than you used to, it is worth asking why.

In many cases, expanding intolerance reflects changes in gut physiology rather than true allergy. Increased intestinal permeability, altered digestive enzyme function, microbiome imbalance, chronic stress, and changes in gut motility can all increase sensitivity.

The food becomes the messenger, not the root cause. Continuing to remove foods without addressing the underlying gut environment can lead to further restrictions without long-term improvement.

When gut integrity, microbial balance, and digestive capacity are supported, tolerance often expands again gradually.

The aim is resilience, not elimination

The healthiest long-term dietary pattern is usually one that is varied, nutrient-dense, and flexible. It allows you to eat socially, adapt to different environments, and include a wide range of plant foods that support the microbiome.

Temporary restrictions do have their place. However permanent reduction in the diversity of your diet, especially when it continues to increase, is often a sign that the underlying gut ecosystem needs attention.

If you find yourself tolerating fewer foods than you once did, that is not a failure of discipline. It is information. The more helpful question becomes whether your focus should remain on removing foods, or on restoring the gut environment so more foods feel comfortable again. Health is not measured by how many foods you avoid. It is reflected in how many you can tolerate without fear.

If your list of foods to avoid keeps getting longer, it may be time to shift the focus from elimination to restoration. I work with women to identify what’s driving food sensitivities and rebuild gut resilience in a structured, sustainable way. You can learn more about working with me here.