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Fasting; Lot of Weakness

Q:

Sa, If a person loses weight very quickly due to fasting long hours and the weight has now dropped to underweight levels as per their BMI report, should they still be fasting? The person functions normally except for experiencing a lot of weakness. Kind regards

A:

Alaykum Salaam
Ruling no 1734: Fasting is not obligatory on a person who cannot fast because of old age, or for whom fasting causes extreme hardship. But in latter case, he should give one mudd food to a poor person for every fast. (Ayatullah Sistani)

Laila Habib