Yes, very truly said by other doctors. Since you are typically having bad breath when u are hungry, u need to consult a gastroenterologist as bad breath arises from not only the mouth but other organ systems also (u can read the details of that in my article on practo healthfeed) or u might just be having a feeling of bad breath without it actually happening. So, kindly get it evaluated.

Bad breath reasons are many most commonly related to the mouth and adjacent structures such as ENT, GIT and others. So therefore you should check your general health as well and particularly consult specialist in Gastrointestinal physician and ENT

Bad breath may not necessarily be originating locally from your mouth , consult a physician / gastroenterologist