Abstinence from eating meat is to be observed by all those 14
and above on Ash Wednesday, Good Friday, and all the Fridays
in Lent. On Fridays outside Lent, they may substitute another
penitential act in place of abstinence.
Fasting is required of those 18 to 60 on Ash Wednesday and
Good Friday. The USCCB has defined fasting in the United
States as one full meal and two smaller meals not equaling
another full meal together. Snacking is not permitted.
People may be excused from these practices for certain reasons,
e.g. pregnant mothers.