Fasting is obligatory for all who are between the ages of 18 and 60. Fasting allows a person to eat one full meal. Two small meals may be taken, not to equal one full meal. 

Abstinence from meat is obligatory for all who are 14 and older. 

Good Friday is an obligatory day of fast and abstinence.

Fridays in Lent are obligatory days of abstinence.