[leonroy]

I used to practise IF regularly and anecdotally found fasting really killed my ability to focus, make decisions and code until I get past that 12 hour hump of ravenous hunger.

It became disruptive enough that I gave up IF on work days and now practise it only occasionally on holiday or weekends. That said my gut flora (see the new research on how gut flora influences the brain [1]) might be reliant on simple carbs and sugar (I have a coffee + pastry habit).

1 - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4228144/

[DiThi]

I've found IF to be much, much easier when doing keto. It is possible that most of the gut flora reliant on carbs and sugar die off after some time.