Prefer your steaks well done? Then you might be toast. Researchers from the University of Texas have found that eating a lot of overcooked meat increases your risk of bladder cancer. The reason? Cooking meat until it's charred can form cancer-causing chemicals. The study found that those who had diets rich in well-done meats were twice—yes, twice!—as likely to develop bladder cancer than those who prefer a little red in their meat.