If your husband is not taking any short acting insulin that I would say that he should avoid ALL carbohydrates; including most kinds of fruits. I will say that missing a major food group is not the healthiest thing in the world to do though.My advice would be to seek professional help to get the education needed for diabetes. I would recommend that you both get this together.
Without this your husband is likely to get swinging BGs which causes bad mood swings. These swings won't be helping his denial of the condition and you have my greatest sympathy. I know from my own bitter experiences how hard it can be for my wife to live with me when I go through a patch of mood swings.
Don't forget that this is a massive change for him, but the sooner he can accept it and make a few changes the better he will feel.
Good luck,
Mark