Statistics from the Centers for Disease Control and Prevention show the U.S. obesity epidemic is getting worse.

The CDC says 4 out of 10 adults are considered obese and 2 in 10 kids have a body mass index considered obese.

“If you look back to the 1970s and 80s, the rates for children were 5 percent and now they’re almost 20 percent,” says Dr. Josephine Connolly-Schoonen, director of the nutrition division at Stony Brook University Hospital.

Doctors say one of the big factors in obesity rates is the amount of sugary drinks available. Connolly-Schoonen also says to avoid fast and convenient food.

“It kind of comes down to eating food that is least processed,” she says.

Doctors say along with eating a healthy diet, adults and kids should be physically active for at least 30 minutes most days a week.