What does Ash Wednesday & Good Friday fasting consist of?

[theg]

A priest told me that it is a mortal sin to eat more than one meal on Ash Wednesday. I had never heard this before. Is it true?

[Fr. Charles Grondin]

According to the USCCB:

Fasting on these days means we can have only one full, meatless meal. Some food can be taken at the other regular meal times if necessary, but combined they should be less than a full meal. Liquids are allowed at any time, but no solid food should be consumed between meals.

So, yes, fasting means that only one full meal is to be eaten. We are allowed essentially 2 small/partial meals that combined do not exceed one regular meal.