My friend Sarah cut gluten from her diet two years ago. Within a month she had more energy, her bloating was gone, and she'd lost six pounds. She was evangelical about it. She told everyone. She side-eyed bread baskets at restaurants.
Then she got tested for celiac disease. Negative. She got tested for non-celiac gluten sensitivity. Also negative.
So what happened? Why did she feel so much better?
The most likely explanation isn't gluten
When people cut gluten from their diet, they tend to cut a lot of other things at the same time without realising it. They stop eating fast food. They stop grabbing a muffin with their morning coffee. They read ingredient labels for the first time. They cook at home more.
In other words, they eat less processed food overall. And eating less processed food makes almost everyone feel better — regardless of whether gluten was the problem.
This is what researchers call the healthy user effect. People who adopt one health behaviour tend to adopt others simultaneously. The gluten-free diet gets the credit, but the cause is usually the broader lifestyle change that came with it.
Who actually needs to eat gluten free
There are people for whom avoiding gluten is a genuine medical necessity, not a lifestyle choice.
People with celiac disease — an autoimmune condition where gluten triggers an immune response that damages the small intestine — need to avoid it completely. Even tiny amounts from cross-contamination can cause real harm. About 1% of the population has celiac disease, and many of them remain undiagnosed for years.
People with non-celiac gluten sensitivity experience real symptoms — bloating, brain fog, fatigue — without the intestinal damage. It's poorly understood and hard to diagnose definitively, but it's real.
For everyone else, the science simply doesn't support the idea that gluten is harmful. Wheat has been a staple food for thousands of years.
What Sarah concluded
She still eats mostly gluten-free, two years on. Not because she believes gluten was making her sick, but because the habits she built while going GF — cooking more, eating less processed food, paying attention to what she put in her body — made her feel better in ways she doesn't want to give up.
Which is a completely valid reason to do anything.