Same thing happens to me and I have no idea why. I am on 6 Tirz and .82 Survo. It has not slowed my weight loss so I just eat when it hits, same as you, to protect my metabolism. Interested in what others think about it.
Most days I have trouble getting food down at all, but then a couple days each month I turn extremely hungry. That always makes me wonder whether the meds have quit working and whether the dose needs raising, yet the feeling fades and low appetite returns. I go ahead and eat more during those times because I keep dropping a few pounds a week and want to keep my metabolism steady. It feels odd though. I doubt it is tied to progesterone since the timing is weeks away from my period. Has anyone else seen this pattern? What might explain it? I take 7.5 mg Tirz plus 3 mg reta and add Cagri now and then.