This is something that concerns me. When I developed hyperthyroidism I was drinking distilled water. I had been drinking this for many years and thought that this should be benefiting my health because it is the purest water available. Now, however, I feel that drinking distilled water is probably one of the worst things that you can do to your health. I felt that this was a significant part of my recovery.
Distilled water enters the body with no minerals but leaves the body with minerals.
The net result is that your body continuously loses minerals and must make up this loss with the minerals in foods and drinks. Since I was a purest, like many people, I didn't drink sodas, coffee, or tap water served in restaurants which is usually made from tap water. My purest beliefs probably contributed more to my loss of essential minerals. I questioned the purity of the distilled water that I was drinking and bought a home water distiller. I was so much sicker I stopped using the distiller.