When NOT to fast

Over a past couple of weeks learned two lessons:

– do not eat meat before starting dry fast
(I started a dry fast right after a big meat-only meal – only to fail a day or so later ... HRV was 10, no other factors ... Filonov mentions but without giving any reason behind it)

– do not start fast less than 24 hours after hard workout
(another fail with idea that I'll recover over the first couple of days into the fast – misconception, stress hormones overflow and fail ... restarted after proper protein-first meals 24 hours later with success)