If you intend to do a juice or water fast, there are generally three stages your body will go through during the fast.
Level 1 This is sometimes the hardest part for many people because the body changes to cope with the new climate it finds itself in. First, your system will change the pH of your stomach to make it more alkaline. It is also during this stage that the digestive tract is cleaned out: some people continue to have a bowel movement daily, while others do not have a bowel movement at all. It is during this phase of the fast that you will notice the greatest weight loss, as water, minerals, and water-soluble vitamins are excreted. Protein will also be lost: up to 75 grams a day to start with, but then it will level off at around 20 grams a day. During this stage you may experience hunger, headaches, sweating, and dizziness.
Stage 2 During the second stage, the body really goes to work and the liver begins to purge itself of its chemical and toxic load. It does this by moving them into the bloodstream for further elimination. As the poisons are released into the bloodstream, you may experience nausea, diarrhea, muscle aches, shortness of breath, nervousness, etc. You will probably feel like you have the flu. Your tongue is also likely to be covered, and you may have bad breath, body odor, and skin rashes. For your body, it is as if you have recently ingested these poisons. Often you need to get better before you get worse.
stage 3 At this stage is where the deep cleaning of the tissues begins. Toxins are removed from the blood, and cell ash is removed from the kidneys. You may have similar symptoms to fasting stages 1 and 2, but you should also get bursts of energy as your body heals itself. During this phase your organs will be detoxifying and renewing. It’s hard to know what to expect during this stage, as a lot depends on how toxic your body was to begin with. This is the stage where many people end up with massive amounts of energy, while others may feel worse than ever.
Warning Fasting should never be carried out without access to a doctor. Even if you have fasted in the past, it is not possible to be objective about your condition while fasting. You must keep your own safety in mind at all times.