The heart pumps slower and blood pressure lowers. Standing or moving quickly from a resting position will cause the blood to flow to the legs. For a few seconds, the brain may not get enough oxygen, causing blackouts and dizziness. To stop a blackout get down on one knee or sit. Lowering your center of gravity will instantly stop a blackout.
Blackouts are more frequent during water fasting.
Fruit juices have a laxative effect which is more pronounced after water fasting. It can be stopped by using the enema. Using psyllium husk during diarrhea will help regulate the system. Toxins can cause muscle tightness in the neck and shoulders. This can result in tension headaches.