When it comes to apples, you may prefer a good Gala or Red Delicious, but new research shows you may want to bite into a Granny Smith from time to time, too. New findings show that people who eat more Granny Smith apples may be unknowingly preventing obesity.

Researchers from Washington State University suggest that apples can thwart obesity in the future because they contain a special type of bacteria. The scientists analyzed seven different varieties of apples and found that green Granny Smiths seemed to have the most benefits.

This study focused on the bioactive bacteria compounds in apples that are not absorbed during digestion, such as dietary fiber. These compounds boost friendly gut bacteria that strengthen immunity and help keep your weight in balance. According to the study, Granny Smith apples produced the biggest boost of good bioactive bacteria.

Because of this, the researchers suggest that eating more apples could aid the overall digestion process and limit a person’s risk of obesity. Today, more than one-third of American adults are obese. Suffering from obesity can also cause other health-related conditions such as heart disease, which is the number one cause of death in the U.S.

So what does an apple have that other foods may not? Apples are not only high in fiber; they’re also low in carbs. A medium-sized apple has about 25 grams of carbs — with 17 percent of your daily dietary fiber — and only 95 calories.

Previous studies have also found an abundance of health benefits from eating apples. They’re high in antioxidants, flavonoids and dietary fiber. They have been linked to improved neurological health, reduced risk of stroke and even lower cholesterol.

But if you want to reap the most health benefits from this tasty fruit, be sure to eat the skin. Researchers say fiber and other nutrients are found in the peel.