Brain tumor research is a relatively modern science that parallels the explosion of molecular biology and modern neuroimaging. While the science is new, Mayo Clinic has a long history of brain cancer treatment and research stretching back over 100 years.
But not all vitamins are water-soluble, and the ones that are lipid-soluble, meaning they like to hang around in your body's fat, don't get flushed out. Instead, if you take too much of a lipid-soluble vitamin over a few weeks to a month, they sit in the liver and can build up to toxic levels, causing problems ranging from weak bones to liver damage, according to Katherine Zeratsky, a registered dietician nutritionist at the Mayo Clinic.
If You Don't Get Enough Vitamin D. 1  Your bones can become weak and can break. 2  Children can get rickets, a disease that prevents their bones from growing properly, delays their growth, and causes problems with their immune system. 3  Adults can develop osteomalacia, a disease that weakens the bones and makes them hurt, and also causes fractures.