Im on metformin 500mg twice a day for my diabetes why am i getting so intensely hungry about an hour 1/2 or so after ive just eaten?

Low blood sugar?: If taking Metformin and are notice low blood sugar symptoms ,low morning appetite, frequent waking in the night, increased cravings or appetite, or lower energy talk to your physician about lowering the dose or switching from the extended release back to meal dosing throughout the day.

Hungry: Perhaps your blood sugar has been quite low after eating foods (carbohydrates) which may release insulin levels as your blood sugar first spikes and then drops low within an hour after insulin release. Checking your blood sugar before and 1or2 hours after a meal would show this pattern. Metformin usually causes modest weight loss unless you eat the wrong foods.