There are two days when the law of fast and abstinence apply: Ash Wednesday and Good Friday.
The law of fast applies to those individuals of the ages 18 to 59, and it means that an individual may have one meal and may take nourishment (other than meat) twice during the day sufficient to maintain strength. Taken together, these two other opportunities for nourishment should not equal another meal. The Fridays of Lent are days of abstinence. The law of abstinence applies to those who are 14 years of age and older, and an individual is to abstain from meat on those days.