The 21-Day Daniel Fast is a partial fast, based on Daniel 10:2-3 in the Bible, in which Daniel says he fasted for three weeks. During the fasting period, only certain foods are eaten. Prayer, meditation and giving the results of the fast to God are also important components of this fast.
The purpose of the Daniel Fast is to deprive the body from eating certain foods as a way to get closer to God. Increased spiritual awareness, becoming stronger in your faith and building more spiritual stamina are also the purposes of this fast. It is also noted in Isaiah that fasting loosens the bonds of wickedness. Since this fast focuses on eating only foods in their natural state, it cleanses the body from many of the impurities introduced by processed foods.
While on the 21-Day Daniel Fast, you won't eat any sugar or meat. Foods containing preservatives and additives, as well as alcohol, are forbidden. Fatty foods, such as butter, and caffeinated foods are also off limits. You will eat primarily fruits and vegetables, legumes, nuts, sprouts and seeds. Whole grains and fish are allowed by some denominations, so ask your pastor if these are allowable.
When you are on the 21-Day Daniel Fast, the way you cook foods is just as important as the foods you choose to eat. Frying foods and eating seasoned foods go against the Fast's guidelines, so these must be avoided. All the foods you eat should be as close to their natural state as possible. You must also be wary of canned foods because canned fruits usually contain added sugar and canned vegetables usually contain added salt -- both of which are against the guidelines.
While you are on the Daniel Fast, you must spend time daily reading your Bible, meditating and praying. At a minimum, you should make time in the morning and at night to do these. If you are doing the 21-Day Daniel Fast as part of a church event, you will likely get a daily reading guide to help you with your studies.