What’s this? Mormons are required to fast on Sunday?
As with almost everything else mormon, the act of fasting is to be done in a certain manner at a certain time and costs money.
Fast Sunday
The Church designates one Sunday each month, usually the first Sunday, as a day of fasting. Proper observance of fast Sunday includes going without food and drink for two consecutive meals, attending fast and testimony meeting, and giving a fast offering to help care for those in need.
A fast offering should be at least the value of the two meals not eaten. When possible, we should be generous and give much more than this amount.
In addition to observing the fast days set aside by Church leaders, we can fast on any other day, according to our needs and the needs of others. However, we should not fast too frequently or for excessive periods of time.