While many schools have removed sugary sodas from the school vending machines and other points of purchase,  sugary fruit beverages and Gatorade-like drinks are still available in most schools.

According to the findings in a new study by the Robert Wood Johnson Foundation high-calorie drinks are the main source of dietary sugar among children. Making these drinks available at school can significantly increase students’ daily calorie intake.

The lead author of the study, Yvonne Terry-McElrath, a researcher from the University of Michigan and co-investigator with Bridging the Gap, a research program of the Robert Wood Johnson Foundation, said in a foundation news release, “Our study shows that, although schools are making progress in removing sugary drinks, far too many students still are surrounded by a variety of unhealthy beverages at school. We also know that the problem gets worse as students get older.”

The researchers surveyed more than 1,400 middle schools and more than 1,500 high schools to track beverages sold by these schools outside of meal programs over four academic years beginning in 2006. Specifically, they looked at places where students could buy high-calorie sodas, such as vending machines, a la carte lines in the cafeteria, school stores and snack bars.

The study, published Aug. 6 in the Archives of Pediatrics and Adolescent Medicine, found one in four public high school students could buy high-calorie soda during the 2010 school year. Four years earlier, sugary sodas were available to more than 50 percent of these students, the researchers said.

While this decrease in schools is encouraging, the investigators found many middle and high school students still have access to other sugary beverages, such as fruit drinks and sports drinks. In the 2010 school year, 63 percent of middle school students and 88 percent of high school students could buy some type of high-calorie drink at school.

The study also showed that while students’ access to higher-fat milk declined, in 2010 it remained available to 36 percent of middle school students and 48 percent of high school students.

C. Tracy Orleans, senior scientist at the Robert Wood Johnson Foundation, said the progress being made to remove sugary sodas from schools is encouraging. “But while this study does have good news, it also shows that we’re not yet where we want to be,” Orleans said in the news release. “It’s critically important for the USDA [U.S. Department of Agriculture] to set strong standards for competitive foods and beverages to help ensure that all students across all grades have healthy choices at school.”