Note, I'm no Dr, dont play one on TV nor did I stay at a holiday inn last night.
I would highly recommend researching the practice of "fasting".
Back in the day, the narrative was "fasting burns muscle, not fat." - this is true, ONLY if you're lean.
Modern research evidences that Fasting is actually anabolic.
If fasting is too hardcore, eat one meal a day...because then you'll fast for 23:30.
Nevertheless, for keeping the britches up, yeah, if you hike over the belly it looks bad, but if you wear under your belly it also looks bad.
My only advise is to keep the belt tight.