In DST Version 162702, you can use the Slurper's light indefinitely without repercussions with the following Steps to Reproduce found in the autogenerated View Full Bug Link. In the video below, you'll see how to exploit the Slurper's light without your hunger being affected at all.
I hope that is enough information. Cheers!
1. Lure a Slurper as close as possible to a Cave Exit. 2. Let it attach to your head. 3. Go to the surface.