Studies have also shown that overconsumption of sugar can alter your taste buds so you begin craving sweeter and sweeter foods, leaving the more natural sweetness of fruits or whole foods less flavourful. Picture: Thys Dullaart

London - If your preschoolers turn up their noses at carrots or celery, a small non-food reward like a sticker for taking even a taste may help get them to eat previously shunned foods, a UK study has shown.

Verbal praise, such as “Brilliant! You’re a great vegetable taster” did not work as well.

“We would recommend using small non-food rewards, given daily for tasting tiny pieces of the food,” said Jane Wardle, a researcher at University College London.

The study found that when parents gave their three- and four-year-olds a sticker each time they had a tiny taste of a disliked vegetable, it gradually changed the children’s attitudes.

Over a couple of weeks, children rewarded this way were giving higher ratings to vegetables, with the foods moving up the scale from between one and two – somewhere between “yucky” and “just okay” – to between two and three, or “just okay” and “yummy”.

The children were also willing to eat more of the vegetables - either carrots, celery, cucumber, red pepper, cabbage or sugar snap peas - in laboratory taste tests, the study said.

Researchers randomly assigned 173 families to one of three groups. In one, parents used stickers to reward their child each time they took a tiny sample of a disliked vegetable.

A second group of parents used verbal praise. The third group, where parents used no special veggie-promoting tactics, served as a “control”.

Parents in the reward groups offered their child a taste of the “target” vegetable every day for 12 days.

Soon after, children in the sticker group were giving higher ratings to the vegetables - and were willing to eat more in the research lab, going from an average of 5 grams at the start to about 10 grams after the 12-day experience.

The turnaround also seemed to last, with preschoolers in the sticker group still willing to eat more of the once-shunned veggie three months later.

Why didn't the verbal praise work? Wardle said the parents' words may have seemed “insincere” to their children.

Though it might seem obvious that a reward could tempt young children to eat their vegetables, the idea is controversial, researchers say.

That’s because some studies have shown that rewards can backfire and cause children to lose interest in foods they already liked, said Wardle. – Reuters