Does America’s war on obesity have some unnecessary rhetorical  fat around the mid-section?  Absolutely, according to Radley Balko  of the CATO Institute who recently attended a national obesity  summit and found the debate lacking some factual nutrients.   Indeed, while anti-fat advocates were comparing obesity to the  threat of global terrorism, cancer rates, which are often linked to  excess weight, have actually declined since 1990, and coronary  heart disease, an even closer link, is down 25 percent.  This isn’t  to say that trim and fit isn’t healthier, but since studies show  that real health risks are generally confined to the seriously  obese, maybe this anti-fat fad could use less high-calorie hype.