KFC's new bun-less Double Down is here and health experts are calling the 540-calorie sandwich--which replaces bread with two pieces of fried chicken, holding two slices of Monterey Jack and pepper jack cheese, two strips of bacon and a creamy sauce--a heart attack waiting to happen. Read More: First Lady Asks Mayors to Lower Obesity Rate Are We Obesity Obsessed?10 Foods That Can Affect Your Mental Health Here's what you had to say: Happily me commented: "I want to try it. It looks great. I work out five days a week and I eat right 99 percent of the time. The one time I do eat badly, I want it to be worth it. A few extra laps, a few extra sit-ups." K said: "Anyone who eats this is asking for heart failure. I don't even eat fried food and if this was the last meal on earth, I still wouldn't eat it."