Type 1 diabetes results from the destruction of the cells in the pancreas that produce insulin, while type 2 diabetes is characterized by so-called "insulin resistance", presumably a reduced responsiveness of the body's tissues to the effect of insulin. More succinctly, in type 1 diabetes, insulin is not produced at all, while in type 2 diabetes, insulin is produced, but it is ineffective.
Based on this description, one would expect that type 1 and type 2 diabetes would look similar, with maybe type 2 diabetes being a milder form of the condition. This is not the case, however. The diseases are markedly different, at least when it comes to their effect on body weight.
Type 1 diabetes results in wasting:
The images show a type 1 diabetes patient before and after insulin treatment.
In contrast, type 2 diabetes is associated with obesity, exactly the opposite scenario.
If the body does not respond to insulin in type 2 diabetes, why don't those afflicted waste away, in the way that (untreated) type 1 diabetes patients do?