Fermentation is not applicable to edible curd. It is applicable to barley, it is applicable to mollases by which we derive alchohol.
ACID + BASE = SALT is just chemistry
CURD is Divine (...
I read the answers and surprised at perfect answers to Vrat. I like to pronounce aadyaatmika as Adhi aatmika that gives answer directly.
Purpose of Vrat:
To realise AATMAA of ourself - ADHI AATMIKA