re: How do I tell my wife that I don't like her gumbo?

As would mine. I wouldn't have to ask OP's question about my wife, because I know she wouldn't care too much. Since he's asking, I assume that's not the case with his wife. There's a chance it wouldn't be a big deal if he just said, "It must be my tastes changing. I know everyone else likes it," but I don't know his wife, so my advice is based on the worst case scenario.