[Hekomi]

Oxbow is rather nutritionally inadequate for hamsters. The CHA used it and many hamsters lost condition badly.

For a diabetic dwarf, I would probably go with something more like Sunseed Critter Cubes and perhaps Vitakraft.

Otherwise, any species of hamster will likely do well on Higgins Sunburst and Mazuri Rat and mouse. Diabetes is much more related to genetics in the USA, than obesity - and provided you're feeding a high quality diet, and provide exercise, there shouldn't be the opportunity to get obese.