In short animal source food is prohibited. Fish is allowed twice during 40 days of lenten fasting : on Palm Sunday and Annunciation.
There are rules about plant source food. Days of the week on which cold or hot food can be eaten. Days on which wine can be drunk. On Sundays and Saturdays vegetable oil and grape wine can be consumed.
If we count all lenten fasting days , on average, there are 195 days in a year in eastern Orthodoxy calendar.