Just to follow up, I decided to come off of keto to check if a couple of apparent side effects of it were related to keto, and they were. This does not mean I am off it for good, I just wanted to see if keto was the culprit.
Namely, I was getting a buildup of tartar on the back of my teeth, which was frankly horrible. I was brushing the back of my teeth every day, but it persisted and built up every day and was almost impossible to entirely brush away. A small price to pay for the improved cognition, perhaps, but it was not enjoyable. I have been off keto for the past 10 days and it has entirely gone away. I found this reddit thread explaining it.
I also wanted to see how much power / strength keto was sapping me of and found my workouts after returning to carb intake so much more fulfilling. I realise this is a known aspect of keto, but I wanted to see for myself. I was feeling so shitty during workouts while on keto that I was often not doing my full workout. With carbs I was pushing heavier, going longer, feeling better. I have found gym work to be so beneficial in all this, that I am questioning whether the inhibition that keto places on me is worth it.
What’s more, while I thought I was feeling more energetic, I realised that in fact I was actually low on energy. The first morning after returning to carbs, I came downstairs to make my morning coffee and realised that I actually did not feel so tired that I NEEDED it. I realise that having only been on keto for 5 weeks and having slipped off the wagon for a day in the middle of that (returning to ketosis with a fast), I was likely still adjusting to keto and that this fatigue would probably go away with time as my body adjusted to using ketones. But it was such a huge difference.
Right now I am transitoning back to keto, sort of, having reduced carb intake over the past couple of days, and today I am likely to follow my keto eating pattern.
However, I am wondering whether to try an anti-inflammatory diet instead, which is also very low carb, but allows me more fruits and vegetables and stuff. I am wondering if I limit the carb rich fruits and veg and only eat some wholegrain carbs (brown rice, etc) if I could get (at least some of) the cognitive benefits of keto without so many of the drawbacks.
Will update again.
EDIT: I forgot a very critical negative of the keto I noticed, mainly because the pain has gone away so it is out of my mind. Over the summer I developed bad pain in my lower back (I injured it when I was much younger and tend to have a bad couple of weeks every year, however this time it wouldn’t go away). I eventually successfully managed to rehab to almost painlessness / full mobility between mid-August and early-October through physio assigned exercises. After starting keto, the pain came back, and no matter how much stretching and exercises I did, it persisted. Since going back to carbs the pain has pretty much gone away again, despite the fact I have only been to the gym and done my stretches maybe three times in the past ten days (I was previously going daily). It is starting to tighten up a bit now, but I know from those three sessions that I can do my stretches and get significant relief. This is an absolutely MASSIVE drawback for me with regards to keto, because the pain and restricted mobility is very inhibiting.