A long-term analysis shows that people who drink caffeinated coffee and tea have a lower risk of developing dementia, although the study does not prove cause and effect. Dr. Céline Gounder, CBS News medical contributor and editor-at-large for public health at KFF Health News, warned that the results should be taken "with a massive grain of salt."  The research, published in the medical journal JAMA on Monday, analyzed data on 131,821 people who had participated in two studies that ran from 1986