."NUTRITIONPass on the extra carbsBread, bagels, pasta, potatoes and pancakes - you just can't get enough, right? Wrong, says sports nutritionist Nancy Clark, author of Nancy Clark's Food Guide for New Runners (£12.95, Meyer & Meyer Sport). Running two or three miles

physiologist at the University of California in San Francisco, Engler, along with her twin sister and fellow PhD Marguerite, has spent the last 15 years researching the connection between diet and blood vessel health. In 2004, the Englers published the first

of Sports Medicine, which calls for 590-1180ml per hour.For the first time in its 107-year history, the Boston Marathon this spring provided all 20,000 runners with a fold-out pamphlet from the American Running Association and the American Medical Athletic