On which day do Catholics most strictly observe meat abstinence?

Catholics most strictly observe meat abstinence on Ash Wednesday, marking the beginning of Lent, a significant period of penance and reflection in the Catholic tradition. This day is pivotal as it sets the tone for the Lenten season, which lasts for forty days leading up to Easter. The observance of fasting and abstaining from meat serves both as a form of sacrifice and a reminder of the spiritual significance of Lent.

While all Fridays during Lent are also designated for abstaining from meat, Ash Wednesday holds a unique importance as it is the initial day of this solemn season, often characterized by a more rigorous observance. Other days, like every Sunday and Saturdays, do not hold the same level of strictness pertaining to meat abstinence during Lent.