My wife (who studied dietetics/food & nutrition) while at university volunteered for a pre-diabetes program whose sole purpose was to stress to people who were at high risk for developing type2 diabetes that they could stave off the effects of the disease by eating more healthily, and explaining how they could accomplish it.
The vastly important thing to stress here is that a reduction of the level of fat is the important part, not starving themselves. Presumably other forms of weight loss (as a means to better overall health) would have the same sorts of effects.
Starving one's self should not be taken as the first step that people should reach for, and even if people were to do so, they should make absolutely sure that they're still getting proper nutrition so that they are losing weight safely.
tl;dr: it's unhealthy to be morbidly obese. Your health improves if you stop being morbidly obese. That can include the effects of type 2 diabetes.