Had my boy out today and noticed that despite backing off his feeding to once a month for the past 5 months, hes' still gaining weight...he's 6 years old 1526g and is eating small rats. He definitely has squishy rolls when he coils up I'd at least like to maintain him at this if I can't get the weight down.

His spine is not yet dented below his fat / muscles, but I don't want to risk fatty liver syndrome or other health issues.

I definitely don't want to withhold food unduly, but how long between feeding would some of you more experienced keepers back an adult off to? His vet recommended feeding every other month, but I don't know if that would help.

I've upped his exercise and take him out more regularly to slither around the garden and such but I don't know if exercise works in mammals as it does in reptiles :/