Can I take one meal a day, a kind of intermittent fasting, if I decide to do that one meal after Isha? Is there any ruling on not skipping breakfast?
Fasting in Islam has got a clear procedure in Quran and authentic Hadeeth. We need to follow it and not create or follow another fasting.
You need to consult you doctors whether have just one meal in 24 hours is not harmful for your health.
It is allowed to have one mail meal if you are not fasting but don't harm your health or cause dehydration.
I advise you to fast, so that you will get the spiritual and health benefits as well as reward of fasting.
Wassalam.