The Public Health Agency of Canada’s (PHAC) Multisectoral Partnership Program (MSP) advances innovative solutions to public health challenges by providing the co-investment needed to test or scale-up the most promising primary prevention interventions. An Impact Canada Fellow worked with the department to help improve the outcomes of MSP’s portfolio of interventions by leveraging behavioural insights. With a strong understanding of what works in supporting and sustaining healthy behaviour change, PHAC can better encourage Canadians to live healthier.