Fasting Side Effect 5: Vomiting/Nausea

Anecdotally, it has been reported that periods of nausea and/or vomiting can accompany a fast- especially in the early phases.

Although the exact mechanism remains unclear, speculation exists that the gallbladder may be contracting bile out into the duodenum, a part of the small intestine. Some of this bile can make its way into the stomach, causing nausea and vomiting. Bile has a greenish-yellow color and distinct odor. It's purpose is for the digestion of fats and its important for digestion in the presence of food. Ingesting food stimulates its release while its release during a fast is not completely understood. There are genetic conditions such a Gilberts disease of the liver that predispose individuals to abnormal metabolism during periods of fasting. Such conditions are considered to be contraindications to fasting so any profound nausea or vomiting- especially if accompanied by a yellowing of the skin or sclera (whites of the eyes) should prompt an immediate medical evaluation. Less commonly, nausea and vomiting could be a sign of stomach irritation something more ominous (though rare) such as bowel obstruction, a far more serious condition. A good rule of thumb is that if vomiting persists more than 24 hours, you should seek immediate medical care as you are in danger of becoming dehydrated. With nausea present, it will be difficult to break your fast (as you will not want to take in food). However, you should try to drink as much fluid as possible, either in the form of water or isotonic drinks (Gatorade, Powerade).

Nausea may actually be a healthy response your body is mounting so don't get discouraged.

That being said, it is wise to err on the side of caution so please DO NOT endure excessive fluid loss