Canada has episodically discussed guaranteed annual income (GAI) as a poverty reduction strategy, and the idea has garnered renewed attention. We investigate the potential effectiveness of such a strategy by examining food insecurity as an indicator of poverty in unattached low-income adults age 55 to 74 years before and after they become age-eligible for publicly financed pensions at age 65. Results from the Canadian Community Health Survey (2007–2013) showed that Canadians over age 65 have half the prevalence of food insecurity of low-income Canadians under 65. Seniors' public pensions, as an example of GAI, are an effective poverty reduction strategy.