I sometimes want to go crazy when I hear that line.
Captive monitors can easily become obese, so it s a good idea to avoid fatty foods.
Rodents are one food which, if a monitor is fed too much of, will cause it to become obese. Rodents should be fed sparingly, maybe once a week or so. Some varanid owners only feed rodents once a month, others don t even give their varanids any rodents. Another high fat food that is commonly fed to monitors is cat food and dog food. I would personally recommended that you avoid these foods completely.