One thing that is normal is mistaking hunger for thirst. Another thing that's normal is for people with diabetes to be thirsty.
The same part of your brain is responsible for interpreting hunger and thirst signals, which can result in mixed signals. Signs of hunger include feeling weak, irritable or moody or your stomach rumbling or feeling empty. True hunger comes on gradually, not suddenly.
By the time you feel thirsty, you may already be slightly dehydrated. Some symptoms you may experience include dry eyes, headache, sluggishness, nausea, dizziness, dry skin and constipation. Your urine may also be a dark yellow, and your mouth may feel dry.
Is it hunger or thirst? Something dieting organisations in the UK suggest is drinking water and see if this gets rid if the "hunger". You should try and drink and eat regularly anyway. Little and often was recommended, not so easy with food, although I nibble at nuts or small pieces of cheese if feeling peckish and knowing that I'm properly hydrated.