It absolutely could be.
When I lost 106lbs, I exchanged my eating addiction for a shopping addiction. Never spent large sums, not very large anyway, just a lot of small ones. A lot.
So 2 years after I nearly got to goal, I hit financial meltdown.
I am now totally financially in control, every penny I own, I know its name and it stands to attention when I come into the room - but I haven't kept my weight down.
It's as though whatever self-destructive addiction I've got, I can squash it down one place but it squirts out another.
I am working really hard now on not compensating for controlling my eating by letting something else take over!
So yes, it could well be a side-effect!