> Why Is the American Diet So Deadly? Too much sugar. Too carb heavy. Not enough fiber (fruits, veg). Fats demonized for a long spell. No time for preparing whole foods in daily lives. No easy access to cheap, prepared whole foods. Edit: car-focused culture and zoning laws/planning that result in more sedentary day-to-day lifestyle that magnifies the effect of the poor diet.
It's the carbs.
Also, with a pinch of pedestrian-hostile design, where some places don't even have sidewalks.