IMHO we should avoid getting too excited by these "Scientists have
found a gene!" reports. This particular report confirms the findings
about this specific gene which had previously been reported in
specific fat metabolism experiments with transgenic mice.

However, according to the human genome mapping gang, there are
hundreds of genes associated with obesity and T2 diabetes. And unusual
proneness to obesity and T2 diabetes are also found in human
populations with other obesity/T2 genetic factors than this one at
work, such as the Pima Indians and the Pacific Islanders.

The general interesting point seems to be that human populations
regularly exposed to episodes of famine not surprisingly develop
tendencies to pile on the fat unusually quickly in times of
plenty. Unfortunately when these populations don't get exposed to
episodes of starvation in between the episodes of plenty they just
pile on the fat, and pile on the fat, and pile on the fat.

It seems to be the case that there's quite a lot of genetic routes in
this rapid fattening when well fed direction, and at least many of
them seem to be associated with a prevalence towards T2 diabetes if
the tendencies to pile on the fat aren't controlled.  Visceral adipose
tissue (aka tummy fat) has bad effects on the progression of T2
diabetes and its complications regardless of which specific genetic
abnormalities helped your body to pile in the pounds.

In other words, when we talk about "good numbers" and "good control",
we're shouldn't just be talking about BGs and blood lipids. Weight
matters too.