Pupils have been told not to take large bottles of fizzy drinks and energy drinks into a school.
Lodge Park Academy in Corby has introduced its Healthy Eating Agenda to help students stay more focused throughout the school day.
Associate principal Alison Hayes said: “We were finding that students were buying energy drinks and consuming them during the morning.
“After discussions with both the staff and students, it was clear that the excessive sugar meant some people were losing concentration in the short term, and by the end of the day were feeling flat and less responsive.
“We appreciate that everyone gets tired, but all the research shows that this type of drink and the ‘sugar rush’ is not beneficial to good learning.
“As a result we have banned them from the academy’s premises.”
The changes are part of Lodge Park’s commitment to providing students with a healthy learning environment.
Mrs Hayes added: “Through the David Ross Education Trust, we have just secured the funds for a huge redevelopment of our main eating and social area.
“We are creating a space that will become the heart of the academy.
“It will provide a stunning place for students to learn, eat and talk to their friends and peers.
“As part of this we will also be reviewing all the catering that we provide to ensure that we’re supporting our students to be as healthy as possible.
“You only have to look at the latest Ofsted guidance to see the link between good nutrition and success in the classroom.
“Some soft drinks, fruit juice and some fizzy drink will continue to be available at the school.
“What has been really great to see, however, is that students are discussing what they are eating and drinking and the effect this has on them.”
Any banned drinks found are being confiscated.
Researchers in America have said that sports drinks are no more beneficial after exercise for children than water and have high levels of sugar.
This increases the risk of obesity and their acidity can erode teeth enamel.
The researchers also said that the very high caffeine content of energy drinks makes them unsuitable for children.
The Food Standards Agency recommends that “children, or other people sensitive to caffeine, should only consume in moderation drinks with high levels of caffeine”.