i’ve just seen another post of yours which indicates that you have only just started keto, is that right? I wouldn’t be contemplating fasting at this stage but rather getting in the swing of things with keto and getting fat adapted.
As to your question regarding fasting (for later) - no! What you are listing is OMAD and you have already stated that you aren’t eating enough on most days and only just enough on feast days. You MUST eat well on days when you are not fasting. It is crucial that you get the nutrients you need when you do eat to compensate for when you don’t. You really can’t alternate not eating much with eating even less without consequences like hair loss, fatigue, etc.
I adopt the pattern I mentioned when I get my act together and it works as follows…
I tend to eat two meals a day but often 3 or at least 2 plus a light meal/snack.
Monday - fast from Sunday evening meal through to Tuesday breakfast
Tuesday - breakfast around midday (so fast for me will be 36-40 hours) and dinner so two meals that are NOT light on calories. As I said before eating days should NOT be below what your energy intake should be for a day.
Wednesday - repeat Monday
Thursday - repeat Tuesday
Friday - repeat Monday/Wednesday
Saturday - repeat Tuesday/Thursday
Sunday - feast. Feast means that you really EAT. You are feeling up for the next week and this is a day to go over what an average daily energy intake would be. I’m not talking about gorging yourself until you feel sick but just really indulge and enjoy the feast day. Make your last meal nice and fatty and you will find it easier going into the first fast.
This is just one pattern though and I am am not saying it is what you should do. Everyone’s ideal fast is different and you need to find what works for you. Check out other posts on the forum about fasting and the links to websites like IDM that will be listed. The important thing is to EAT when you eat. It feels to me like you are trying to do too much too soon in an all out attempt to lose weight. It’s not a race and it is all about optimising your health. You won’t do that if you consistently under eat.