Its store refit strategy has included the roll out of a new fresh food format with salad bars and more chilled units.
The society said the new layout had helped it compete with multiple outlets which had opened close to food stores.
In addition the society began sales based ordering trials 18 months ago. "Now 50 of our 68 food stores have it for beers, wines and spirits," said chief executive Colin Bird. "We are looking to complete that process and roll it out to ambient and frozen by August."
He added: "We are looking to expand our food operation, with the bulk of expansion coming from existing businesses or stores built from scratch."
Pre-tax profit rose from £3.1m to £9.1m in the year to January 25 on turnover up from £221.9m to £227.2m. The results include the society's toiletry, property and funeral businesses. Food sales for the year totalled £150m.
Bird said: "Food sales are ahead of last year despite the disposal of our Penicuik store, near Edinburgh."
Two food stores were opened in Edinburgh last year.