Fat adaptation is a process of developing the mitochondria needed to efficiently fuel a predominantly fat burning body. It’s a gradual process that continues for a long time. You can’t undo what’s been done with one meal in that regard.
The real risk in a cheat meal type of thing is that your body is now less prepared to take in large amounts of fast acting glucose. It will deal, but you may not feel great. Then there is the idea of kind of being ‘cleansed’ of sugar and grain which we know is inflammatory. Reintroducing those can be troublesome if you happen to be sensitive then. Even if you don’t think you were before. It may just be you didn’t notice because it felt normal.
Another major risk, and we see it all the time, is this one time meal preventing you from even getting back on track again. You are very likely to gain water weight from reintroducing carbs and that can really do a number on your head and for some people they decide ‘why bother’. If you get back on track immediately you will lose that water weight again. Some people find it happens within a couple days. Others find it a bit more difficult.
Being metabolically flexible is a good thing. In that a person could have some carbs every now and then without issue. I think that’s probably a normal thing for any human. I don’t think however, those carbs are meant to be large amounts of sugar, or grains in any quantity. I’d say if you can help it, choose the items that don’t contain grains. If something has sugar, just don’t go crazy, pace yourself. Basically, I would choose any kind of potato or similar starchy food or even something with sugar over grains. I don’t know what kinda of foods the place might have to be any more helpful.
As far as wine goes. Stick to dry reds and you should be fine. If you haven’t had alcohol since going keto, be aware that it’s effects are more dramatic now. You tend to get drunk with much much less than before. So that in itself helps! Lol
Whatever happens, enjoy yourself but be careful not to fall into thinking of those “forbidden foods” like they are some kind of crazy amazing and special thing that you normally can’t have. I realize that’s true in a sense. What I mean really is don’t put them on a pedestal. Try to keep your head from idolizing them. I think there’s a mental game to keeping that kind of thought in check in order to be able to ever pass on something and not go crazy because of convincing ourselves “this is special though”. I think it’s healthier to recognize that even special occasion foods aren’t meant to just eat at will all we can stuff in our gullet! Ya know? For me, keeping that mindset has made it possible to pass on Christmas cookies and pumpkin pie WITHOUT feeling deprived. Or if I did choose to partake, I may be more able to limit it enough to not be much issue. I personally know I couldn’t use moderation if I started eating those so I don’t. I know that binge feeling would almost immediately kick in so I just can’t do that.