St Mary's teacher and health lead Sheryl Todd said pupils were learning about the harm of sugary drinks.
"We encourage the students to share what they learn with their family. This will stop things like juice creeping back into school in lunch boxes."
St Mary's principal David Macmillan is pleased with his school's achievement.
"I am very proud that children have a greater awareness of the need to eat healthily. It is great to be in partnership with Pita Pit which gives children healthier options for bought lunches."
Ms Jackson said the award was solid recognition of the school's "amazing efforts" to create a healthy learning environment.
Find out more about the Heart Foundation's Heart Start Award at www.learnbyheart.org.nz.