People struggled more to change their views of favourite and disliked foods after those preferences were initially reinforced, suggesting that how healthier choices are introduced may shape their success.
New research from Yale School of Medicine suggests that the battle to change eating habits may begin long before a person reaches the dinner table. A study published in Communications Psychology found that people’s existing feelings about food can make it harder to learn new associations around what is good or bad for them, which may help explain why diet changes are often so difficult to sustain.
The research team, led by Ifat Levy and Alex Rich, recruited about 280 participants and asked them to identify four snacks they felt strongly about: two they liked and two they disliked. Participants were then tested on whether a computer programme would attach positive or negative points to those foods. In some rounds, the computer matched their instincts. In others, it asked them to do the opposite, forcing them to link foods they liked with negative points and foods they disliked with positive ones.
What stood out was how much harder it was for people to unlearn or reverse those food-based judgements once they had first been reinforced. Participants who began with trials that confirmed their existing preferences later struggled more when the task changed direction. By contrast, those whose preferences were challenged earlier in the experiment adapted more readily. Levy said the results suggest that “our preexisting preferences for food are very strong and hard to change”, while Rich noted that even small changes in how people are introduced to food-related learning may have an outsized effect.
The findings may have practical implications for health professionals and caregivers trying to support healthier eating. According to Yale and the published study, participants also found it easier to assign new values to foods they already disliked than to foods they enjoyed, hinting that adding healthier items to a diet may be easier than trying to remove favourite ones. The researchers said the work could help explain why dietary interventions often struggle, particularly among people with binge-eating patterns, and why early, careful framing may matter when new eating habits are being introduced.
Disclaimer: This content is for informational purposes only and is not intended to be a substitute for professional medical judgment, advice, diagnosis, or treatment.
