What makes people picky eaters, and can it change in adulthood?
You’ve been at dinner somewhere, and somebody one table over is picking onions out of their pilau or refusing to eat traditional vegetables.
While people often laugh this off as childish behaviour, science shows it is actually a real brain trait.
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Being a picky eater is not about a bad attitude; it comes down to genetics, brain chemistry, and how someone processes smells and textures.
Inside the picky brain
Our relationship with food goes back to an ancient survival mechanism called food neophobia, which is simply the fear of new foods. Long ago, this fear kept human babies safe from eating poisonous wild plants.
Children have a small taste window when they are infants where they accept various flavours. But around age two, that window closes and the fear of new food spikes to protect them. For some adults, that protective switch never turns off.
It gets even more intense for people with high sensory sensitivity. For them, a food texture is not just unpleasant; the brain sees it as a direct threat.
A study published in the journal Appetite defines picky eating as “an aversion to, and usually refusal to eat, a wide variety of commonly accepted foods, even after sampling them.”
When a picky eater smells or feels certain foods, the brain triggers an automatic gag reflex.
Training the adult palate gently
Many people think that if someone hates a food as an adult, they will hate it forever. The good news is that the brain can adapt, meaning food preferences can change.
However, forcing someone to eat things they hate never works. Forcing an adult to clear a plate of disliked food causes psychological trauma, which only makes them reject the food even more in the future.
Instead, experts recommend a method called graduated exposure. This means breaking down the eating process into tiny, stress-free steps.
A person can start by just looking at a new food on their plate for a few days. The next step is smelling it, then touching it, and finally placing a tiny piece on the tongue.
Doing this over several weeks teaches the brain that the food is safe, making it easier to try new meals without any stress.
