My friend's wife is a vegetarian but he is a non-vegetarian. Now she wants him to convert and he does not like it. What should he do?

When one marries a person, he/she should accept as he/she is without asking the other to change. Why should the husband change his food habits at this juncture of his life? He should try speaking with his wife that converting would making him unhappy. She should stick to her food habits and allow him to follow his.