Self-control and impulsiveness in children and adults: Effects of food preferences.

Researchers asked kids and adults to pick between a small snack right now or a bigger snack later. They used foods the person already loved, liked, or only sort-of liked.

Each person first tasted and ranked six foods. Then they played a game where pressing one button gave a tiny portion now, and another button gave a large portion after a short wait.

When the delayed snack was the person's top-ranked food, they usually waited. When the immediate snack was the favorite, they usually took it right away.

Adults acted the same way. Food preference, not age, decided the choice.

Cullinan et al. (2001) later showed kids with ADHD can learn to wait up to 24 hours if you slowly stretch the delay while keeping the reinforcer big. That builds on this finding by adding a teaching step.

Meyer et al. (1987) looks like a contradiction: they found reinforcement did not change which foods kids liked. The difference is aim. B et al. (1991995) used existing likes to drive a choice; H et al. tried to create new likes. Preference stayed stable, but you can still use it to steer waiting.

Hansen et al. (1989) showed younger kids only track amount, not delay. B et al. confirms that once kids do notice delay, the food's yum-factor still rules the choice.

Before you run a delay-tolerance program, rank the edible reinforcers. Offer the most loved item only if the client waits. Swap in a less loved item for the immediate option. You should see more waiting without extra teaching.