Of course it's OK as long as you have to bother yourself with thinking about where their food comes from, the devastation of the rain forest caused by their clearing of swathes of acres of woodland for cattle, the environmental problems caused by what they do and the pollution caused by the bags and wrappers, the horsemeat in their "beef" burgers, the poor quality of "meat" in the first place, the dangerously high levels of salt and fat they include in their products and, because they are a large company employing thousands of UK slaves (I'm sorry I meant workers - they all look so happy and pumped don't you think?), the obligatory excessive tax avoidance and unhealthy influence on government policy.
But hey. As long as you have your immediate selfish needs satisfied that's the main thing. Thinking is "hard" and "boring".