If you’re watching your weight, you may have to watch your white bread consumption, too.

When white bread is a diet staple, you may be more likely to become overweight or obese than if you favor whole grain bread, according to a study.

Researchers tracked the eating habits and weight of more than 9,200 Spanish university graduates for an average of five years.

Participants who ate both white and whole grain breads were not at increased risk for weight gain.

But those who ate only white bread and had two or more portions of white bread a day were 40 percent more likely to become overweight or obese than those who ate less than one portion of white bread a week, according to the study authors.

There was no significant link between eating whole grain bread only and becoming overweight or obese.

This may be because of the types of carbohydrates, fiber content, and other ingredients in whole grain bread, according to Miguel Martinez- Gonzalez, a professor at the University of Navarra in Spain, and colleagues.