During the fast, you have extra time. For advice on how to break fasts and the benefits of fasting according to 17 different MDs (exact quotes from them) see this site on FASTING. Also it has a page on ENLIGHTENMENT which you should find interesting, which also tells about yoga.
It has info about losing weight from The New England Journal of Medicine and a hospital study on fasters trying to lose weight. You can buy granulated kelp in shaker bottles. Use it instead of salt. It is a sea vegetable (seaweeed) and is loaded with iodine and trace miinerals and it is a food. Dirt with trace minerals is not a food. I have done a great deal of fasting and I do not feel euphoria from it. Although on ENLIGHTENMENT page above it explains how I feel euphoria a great deal of the time.