Despite our best intentions to eat something healthy, we often choose sugary snacks.

Dutch researchers asked 585 participants to pick between four snacks: an apple, a banana, a candy bar and a molasses waffle.

About half of the participants indicated they would choose the apple or banana.

But when presented with the actual snacks a week later, 27 percent of those who had said they'd pick a healthy one switched to the candy bar or waffle. And more than 90 percent of those who had initially made an unhealthy choice stuck with it.

The researchers figure that while we are in control of our intentions, our actual choices are often made impulsively, even unconsciously.

"A substantial gap between healthy snack choice intentions and actual behavior was demonstrated," said study leader Pascalle Weijzen of Wageningen University in the Netherlands. "Despite that gap, the results suggest that individuals who plan to make a healthful choice are more likely to do so than those who plan to make unhealthful choices. Because more than 50 percent of the population seems to have no intention at all of making a healthful choice, identifying tools by which this group can be motivated to choose a healthful snack is strongly needed."

The study is detailed in the September/October issue of the Journal of Nutrition Education and Behavior.