I'm not OP but have been on strict keto for >5 yrs. Every metabolism/lifestyle is different so, N=1 and I can only share my experiences with it. By design, a ketogenic diet greatly reduces and evens out glucose spikes as opposed to the Standard American Diet. Prior to keto I was obese and mostly ate a normal carb-heavy diet, except when I was trying to lose weight with a typical calorie-restricted diet.

Keeping my body in a constant ketogenic state has not only allowed me to be thin for the first time in my adult life, it also enables me to sense changes to my metabolism based on what I eat and when, especially my blood sugar. Now when I consume too much of the wrong mix foods I can feel the glycemic impact when my blood sugar spikes. There's a subtle "up" phase which feels quite artificial followed by a longer "down" phase. In more extreme cases the down phase extends through to the next day. I vividly remember the one time I consumed a significant amount of sugar all at once since being in keto. I was traveling with family and was in a place with a 'legendary' unique dessert and had a full portion of it. Within a couple hours I had a terrible, almost debilitating, migraine headache (which I never get normally). The headache persisted through most of the next day and I felt generally lethargic and hungover.

I suspect this sort of up / down flow was constant before keto but I had adapted to it and didn't perceive the effects. Now that my body is fully keto adapted, a previously 'normal' spike was disruptive like dropping a tray of dishes in a silent library. After losing all my excess weight over the first 8 months of keto, I realized that I loved the feeling of being in a ketogenic state. For me and my metabolism type, the benefits include sharper cognitive abilities and a much more even emotional balance. To me these benefits are easily worth the small effort to maintain keto. Obviously, radically changing diet is disruptive and difficult at first but it gets much easier after a few months and is now entirely on auto-pilot for me.

If I'd read what I wrote above prior to experiencing it myself it would have seemed weird and not something that would happen to me. That's how different and almost alien the physical, mental and emotional changes felt to me. I knew I was overweight but I had no idea how the tidal glycemic forces were impacting my internal state. I did keto as a temporary thing to lose weight. I would never have imagined I'd stay keto for a year, much less for the rest of my life - especially after being thin. But after I experienced such profound effects first-hand, going back was unimaginable. However, that's my experience and I clearly have a metabolism that's sensitive to glycemic loading, I just never knew it. Other metabolism types may have different results. I don't think there's really a way to know without trying it for a couple months. Prior to keto, I was overweight, had increasingly high A1C tests, was pre-diabetic and on statins - so those may be markers to look for. The long-term health issues from carrying excess weight along with the prospect of becoming a type 2 diabetic needing to inject insulin for life were also sufficient motivation to get off my ass and make dramatic changes.