Since the Constitution "Repent" of the 1966 of Paul VI and the "New Canon Law" of 1983 of John Paul II have no legal value, the discipline observed under the pontificate of Pius XII is still in force (according to the Canons 1250-1254 of the Benedictine canon law of the 1917, modified by the Decree from the S. Congregation of Rites of 16 September 1955 and from the S. Congregation Council of 25 July 1957).
The current law for the faithful of the Latin rite is therefore the following:
– THE LAW OF FASTING obliges all the faithful who have accomplished the 21 years old and have not yet started their 60th year.
– THE LAW OF ABSTINENCE from the flesh obliges all the faithful to start from 7 completed years.
IL FAST consists of having only one meal a day and two small lunches during the day (moralists quantify in 60 grams in the morning and 250 grams in the evening; the evening meal is always lean).
L’ABSTINENCE prohibits the use of meat, of meat extract or broth, but not that of eggs, dairy products and any animal fat condiments.
DAYS OF ABSINTION FROM MEAT:
– every Friday of the year (except if there is a holy day of obligation, but this only applies outside of Lent).
DAYS OF ABSTINENCE AND FASTING:
– Ash Wednesday;
– every Friday and Saturday of Lent;
- on Wednesday, on Friday and Saturday at Four Time;
– Christmas Eve (24 December), of Pentecost, of the Immaculate Conception (7 December),
of All Saints' Day (31 October).
DAYS OF FASTING ONLY WITHOUT WITHDRAWAL:
– all other weekdays of Lent (There is no fasting on Sundays).
THEY MAY NOT PRACTICE ABSTINENCE:
– the poor who receive meat in alms and have nothing else to eat;
– the sick, the convalescents, those with weak stomachs, breastfeeding women, pregnant women if weak;
– workers who do heavier jobs on a daily basis;
- could, children, servi, all those who exercise in service being forced to do so, and who cannot have other sufficiently nutritious food.
THEY MAY NOT PRACTICE FASTING:
– those who would fast with serious inconvenience: sick, convalescents, weak of nerves, breastfeeding or pregnant women;
– poor people who already have little food available;
– those who carry out work that is morally and ordinarily incompatible with fasting (es: heavy work);
– those who do very tiring intellectual work (es. students undergoing exams);
– those who have to make a long and tiring journey; for a greater good or for a greater work of piety, if this is morally incompatible with fasting (es.: assistance to the sick).
source – https://www.sodalitium.biz/disciplina-del-digiuno-dellastinenza/?fbclid=IwAR2rlqfTVrWcIRag94P205aRMICBlQcsBhQjpiWD9ipNDyVswLOYKceHrrA