@Hkcardenas89 I read several excellent books many years ago on fasting. One accomplished 40 day fasts several times finding them especially helpful physically as well as spiritually. I attempted the 40 day fast but because of being in the prime of womanhood, could not make it beyond 27 days. I tried twice. You must have water or fluid after 3 days. I realized since then that keeping hydrated helps the body to continue the fast. I find fasting very spiritually powerful!