Milk and cheese and eggs used to be prohibited on some fast days, including Lent. I think it still is in some of the Eastern Rites and it is among some of the Eastern Orthodox. Fasting rules used to be much stricter but the Catholic Church became lenient a little at a time, not just after Vatican II.
And Deo Gratias for the Church legitimately updating Herself as the times required. If nothing was ever to be judged, changed, or modified, then Jesus would have just carved several stone tablets with everything laid out explicitly, and left them with the Apostles.
But no, instead He established an authority/hierarchy including a single head (the Pope, St. Peter) to "loose and bind" on earth.
Mankind has been devolving since Old Testament times. Basically our collective vigor/genes/constitution/health is getting worse every century. And after World War 2 our food became mass-produced, agri-business slop with little nutrition and no trace minerals.
God didn't mean for us to starve to death, or destroy our health. PROVIDENTIALLY, the fasting rules have been changed over the centuries to meet the changing needs of mankind.
That having been said, what happened at Vatican II was ridiculous. The NewChurch only kept TWO fast days, and those are obviously thrown out by most Novus Catholics, since they aren't used to fasting or abstaining. I know "good" Novus Catholics who visit a Barbecue restaurant on Good Friday -- one old lady claimed, "I think they have fish". When they got there, of course they didn't have fish. Did that bother them? Of course not. They shrugged with an "oh well" and ordered the fried chicken. Moral of the story?
You can't have a habit with a period of "every 60 days" or "every 200 days". Something that infrequent is always rounded down to NEVER. Always.