My "fitness commitment" has fluctuated through the year. Having seesawed from zero booze and personal trainer, to booze, fags, and kebabs, back to abstaining from booze and being back in the gym, and so on.
I'd consider my current state to be somewhat off the wagon and in need of a new year detox, but the good news is as I sit here full of sherry, wine, brandy, turkey, Christmas pud, chocolate, etc... I'm still a stone and a half lighter than this time last year.
My takeaway point is; everything is fine in moderation, have a bit off time off from the "everyday is a Saturday" drinking, and eat healthy as often as is tolerable.
Recently had my blood tested for all sorts of things and all came back clear and healthy, including cholesterol; which had improved since the last time.
So for 2020, I'll be taking much the same approach I think.