Fasting is definitely good for health. In fact only the 1st- beginning 2nd day are a bit difficult, the weakness just passed after. And then, you feel good, you feel light. The connection to your inner being is easier. If done as an attempt to connect to the Universe, to feel the Cosmic Harmony within you; it is worth doing. Fasting 5 days is far enought (especailly at the start), even more up to 9 days is no danger for a person in normal health. After it, you will feel energetic and joyfull. Fastenning has obvious effect on the Earth Element, and some explanation given are precise and accurate. Possibly, if you are able to master the element within you, you don't need to fasten to feel this effect. But the Effect on the Earth element is not the only one of fastenning. What is key is why you are doing it. Fastenning in itself change the way you relate to the Universe, it bears by itself a Spiritual Purpose. And This Purpose is there while fastenning whether one belongs or not to a spiritual path, believes or not. Therefore, if fastenning is done for a spiritual reason, the dedication of these days cannot be remplaced and will help to connect to Higher Realm. The Person's Ego will benefit from it and, fastenning by itself helps to refine the element within the body. >From a personal standpoint, fastenning for a few days some years ago has had long term very beneficial effect on my life. After these days, I could not eat any meat. I have not since then. A few months after, I start to eat Organnic Food. From this point, my health starts slowly improving, and has continuously improved since then. It is not only what you eat but, foremost your state of mind while eating. Meditation and praying through once own understanding of the Divine can be more beneficial than any ritual. At these time, I did not feel concerned by Vegetarism, and I did not know it will help me. I never through it was an option for me. It has proved to be a very valuable one. Best wishes, Pierre Mikael