Dic

This may seem a strange question, but how do I make my CAG have better smelling breath. He has fresh fruit for breakfast, cooked fresh veg for dinner and seed whenever he wants it. His cage is kept clean and has regular clean water. But there still seems to be a very nasty smell coming from him and not just at poo time. If anyone has had the same problem (as me not my bird ) or ideas please let me know. thanks.