Dear friend, welcome and thanks for entrusting your query here at HCM!
I am Dr. Prasad Akole (Critical Care Expert- http://bit.ly/Dr-Prasad-Akole) and am glad to address to your query here.
As you already said you are overweight
and are constantly hungry, I have 2 things on my mind.
First: if you also have excessive thirst, and urinate more often, you should check your fasting and post food sugars to look for diabetes
Second: it could be an ulcer, if you feel there is pain in the stomach.
Thirdly, things may be just psychological.
So, better get yourself evaluated at a physician’s.
I hope to have answered your query satisfactorily. I would be glad to answer any further queries. Please ask for any clarifications before closing and rating this answer.
Take care and please keep me informed of your progress at http://bit.ly/Dr-Prasad-Akole
Good Luck! Thank you!!