Not sure whether banning would be in order. People have the right to eat what they like but they also need to be aware of the consequences. Diseases such as cancer, diabetese and cancer continue to be the scurge of the wealthy developed nations.
I have just finished reading a book called 'The China Study'. It might seem to be a little extreme to many but there seems little doubt that a vegetarian, almost vegan, diet is the best for all round health and avoiding cancer. Personally, I am vegetarian for a number of reasons and try to eat as little processed foods as possible.