Berardi talks about it here
This one involves people that do Ramadan
Bulimia and fasting vs Healthy
This one isn't done fasted, but with overfeeding on a 'isoenergetic' as they put it.
What I think it boils down to is, we know leptin drops with fasting(less fat storage), and rises with eating(more fat storage). Now we have to figure out how that can be manipulated so the valleys are greater than the peaks(if fat loss is desired). With the last link I provided, that leads me to believe that for fat gain to be minimal after fasting, carbohydrates would have to be restricted. I know none of this is very surprising.
So while fasting/starving won't directly lead to fat gain hormonally, it does create the right conditions for someone (when consuming the typical garbage diet) to gain fat more easily.