“If there was ever a time when doctors need to be as handy with a peeling knife as they are with a scalpel, this may be it. The draft version of the federal government’s 2010 Dietary Guidelines, which will be formally released in December, identifies obesity as the nation’s greatest public-health threat. It also notes the relationship of fast food (and physical inactivity) to unhealthy weight gain and emphasizes the importance of plant-based foods in the diet. … Dr. Willett cited surveys showing that during examinations of obese patients, doctors often don’t remark on overweight as a health issue.”