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The USCCB website has several questions and answers about Lenten observances.
The last one of these is:
Q. Are there exemptions other than for age from the requirement to fast on Ash Wednesday and Good Friday?
A. Those that are excused from fast and abstinence outside the age limits include the physically or mentally ill including individuals suffering from chronic illnesses such as diabetes. Also excluded are pregnant or nursing women. In all cases, common sense should prevail, and ill persons should not further jeopardize their health by fasting.