Interventions: Flavonoid drink and a matched placebo will be used in this study. Flavonoid drink will contain approximately, 13g of freeze dried wild blueberry powder, containing 250mg of anthocyanin flavonoid, mixed with 170ml water and flavored with 30ml 'Rock's Organic Orange Squash' as it has a low flavonoid content. The placebo drink will contain placebo powder matched for vitamin C (45mg), glucose (4.52g) and fructose (4.79g), mixed with 170ml of water and 30ml 'Rock's Organic Orange Squash'. Participants will be randomly allocated to either placebo or treatment. Participants will be instructed to consume the drink every morning for 4 weeks. The powder will be prepared and sealed in opaque packets. Participants will be provided with 2 weeks worth of supplies at baseline and then in week 2. Parents will be provided with instructions on how to prepare the drinks in addition to supplies such as opaque straws and containers. Assessment of left-over product will be conducted in 2 weeks to allow for continued compliance verification.