My sister is 22 and well I dont know how to put it any other way then that she is fat as a pig. around 220ibs and shes only 5'5. She got diabetes(at first she manage on metformin but now shes insulin dependant after 2 pregnancys) 3 years ago cause of her poor eathing habits and overweight.

Now she is gonna try and lose weight with my help and I have been on her ass for over 2 years about losing weight so maby she finaly has realised she is eating herself to the grave.

But cause of her beeing a diabetic Im not sure how to layout a diet for her. Would a regular low carb diet as most of us follow suite her
What things do I have to consider when helping her?