Supermacs chief Pat McDonagh said he's "concerned" that Ireland could be hit by food shortages this winter.
The fast food boss' words come as McDonald's is set to hike its prices for a number of popular items. The American fast food chain explained that its suppliers are "feeling the impact of rising inflation".
Galway man McDonagh said Russia's invasion of Ukraine has had a massive impact on food production. He said: "Everybody has to get through it, we have to adapt to the new situation and deal with it - and it will level itself out.
Read more: McDonald's Ireland to hike prices of popular menu items including cheeseburger
"I would be concerned, though, in one sense there could be a little bit of a scarcity of food towards the end of the winter up towards December."
One of his recommendations for the public was to "buy a bit of long-life food earlier on," he told The Hard Shoulder on Newstalk. He added that the price of cooking oil has nearly doubled because most of it comes from sunflowers in Ukraine.
He added: "So I think you'll have a lowering of the food productivity in this country as well for the autumn. I can't predict what happens, but I'm just assessing it in my own way."
Mcdonald's revealed that items which will increase in price include cheeseburgers, breakfast meals, main meals, large coffees, McFlurrys, the Chicken Mayo, the McNuggets share box and some Go Large options. The cheeseburger will now cost €1.70, up from €1.50.
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