@Deekon I don’t mind you asking at all, but I think my experience was rather unusual, so I don’t want to set you (or anyone else) up for unrealistic expectations or disappointment.
I was one of those lucky ones… I didn’t really suffer from any “keto flu” at all. Perhaps not having been deep into sugars or too many refined carbs in the first place? I ate a HC/LF diet, but my carbs were complex and (supposedly) “healthy” ones. Hence I suspect my withdrawal was far more muted than many others have experienced. I braced for misery, but felt none.
Also, despite having grown increasing stiff and achy over recent years (with more low level systemic inflammation than I’d ever realized) which I assumed was just part of getting old, I was actually in fairly good shape for a guy in his 60s. At 5’9" I had settled into the low 160lbs range (thanks in part to daily cardio, tai chi, stretching, skiing, hiking, occasional free weights). Not fantastic, but not really too bad either, at least by Western adult standards. I’ve been Rx-free with decent blood chemistry.
So, having missed out on the “flu” part, I soon noticed marked health improvements in every respect within about 10-14 days. It still boggles my mind (which is clearer, focused and more energetic) how things have turned for the better on every front. Too many ways to mention here - but on top of seemingly miraculous reversals to the things that bugged me in recent years, in the past month I’ve also lost 13lbs and 3" at my waist. Energy is high and hunger is limited. And food tastes great.
In fact, it feels a bit like an “embarrassment of the riches” compared to what many experience early on until they adapted and reached the other side of the initial keto hump. So, in answering your question, I do not want you or anyone else to expect that your transitional experience will follow the same path as mine. As the saying around here goes: just “keto on”
One lesson I’ve learned from the forum is that, because everyone is indeed unique, we bring our own different situations/combinations to the table. What we do have in common is that we all seem to do considerably better (except perhaps for those struggling with extremely rare medical conditions) on a ketogenic way of eating, since it clearly seems to fit best with the natural body chemistry we’ve been given.
YMMV, but regardless of how your own journey unfolds, I’d encourage you to stick with it until you begin to reap the benefits that are within your reach. Well worth the near-term adjustments that will likely surface along the way.