A man has been found dead three days after he reportedly overdosed in the toilets of a Hungry Jack's store north of Perth.

It is understood the man had been in the toilets of the Balga Hungry Jack's since Friday before his body was discovered on Monday morning.

Hungry Jack's says it recognises animal welfare and ethical sourcing is an important community demand.

WA police confirmed officers were called to the food outlet on Wanneroo Road regarding a deceased male about 9am.

Police are not treating the death as suspicious and are preparing a report for the coroner.