Is there a religious limit for someone unable to fast that permits them to resort to feeding [the poor]?

Those who switch from fasting to feeding are the elderly and the sick whose recovery is not expected. The inability that necessitates switching from fasting to feeding is when fasting causes severe hardship that is detrimental to one's health. Such individuals should break their fast and feed one poor person for each day they missed fasting. This is the view of a group of Companions and jurists. As for the sick person who does not expect to be able to make up the fast, they should break their fast and feed one poor person for each day.