There’s some text regarding this in the book Divine Liturgy: An Anthology for Worship which outlines the “days of obligation” and the fasting rules.
To abstain from meat every Friday except on Feast Days and the zahalnytsi (the weeks after certain Feasts like the week after The Nativity, week after Pascha, week after Pentecost).
Abstain from meat and dairy on the first day of Lent and Good Friday.
Abstain from meat (but not dairy) the eve of Christmas and Theophany, on the day of the Exhaltation of the Holy Cross and on the day of the beheading of St. John the Baptist.
That is all. The 4 fasting periods in the Orthodox calendar is mentioned as “traditional periods of fasting” but it is just encouraged to fast during these times and not “mandated” like those above.
Also not mentioned in this book but practiced in our Eparchy is that Wednesdays of Lent is also a day of fasting aside from the usual Friday. But again the fast is not the strict fast we would have expected from an Eastern Church.