The ex-Smiths frontman compared the behaviour of McDonald's and Kentucky Fried Chicken to that of Anders Behring Breivik, who killed at least 76 people in two terrorist attacks at the weekend, The Mirror reports.
Before playing 'Meat Is Murder' at the Stodola Club in Warsaw, Poland, Morrissey said: "We all live in a murderous world, as the events in Norway have shown, with 97 dead.
"Though that is nothing compared to what happens in McDonald's and Kentucky Fried S**t every day."
A spokesperson later added: "Morrissey has decided not to comment any further as he believes his statement speaks for itself."
Earlier this year, Belgian festival Lokerse Feesten became a meat-free zone to secure Morissey's appearance.
The singer-songwriter had previously walked off stage because of the smell of cooking meat at the Coachella festival.
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Watch Morissey talking about the meat industry on Channel 4's The Importance of Being Morrissey below: