Key word in the story's headline: "could."  Nobody knows for sure, and I'm not talking about the factors of international trade.  YOU, the consumer, have the power to fool them.  Here's how. 
1. Cut back on eating out.  Personally, I disagree with lumping restaurant meals in with grocery shopping--in our household budget, dining out is "entertainment"--but okay, I'll go with the flow. Just do it less, and when you do, go to sandwich shops rather than big restaurants.  

2. Go grocery shopping more frequently and buy less when you do.  Sounds idiotic, but it's true. You can save big time.  Here's why, from a 2014 CBC story:
"More than $31 billion worth of food is wasted every year in Canada and when energy, water and other resource costs are factored in the true cost could be up to three times that much..."

And almost HALF that food wasteage is ... from households. You and me.  We buy more than we could possibly eat before it goes moldly, limp or mushy (Google Canadian food wasteage)