There's not any reason to think corn and corn syrup are any worse than sugar or rice. Which is to say they're not really a problem at all. Corn syrup products are just tasty things that people with poor self control overeat.
What does appear to be an actual policy problem is polyunsaturated fats. Soy and canola oil accumulate in tissues and slow the metabolic rate, interfering with mitochondrial respiration. If you eat a lot of margarine and fried foods and ranch dressing, your resting metabolic rate will measurably decrease over time, leading to fat gain even with static calorie intake.
What does appear to be an actual policy problem is polyunsaturated fats. Soy and canola oil accumulate in tissues and slow the metabolic rate, interfering with mitochondrial respiration. If you eat a lot of margarine and fried foods and ranch dressing, your resting metabolic rate will measurably decrease over time, leading to fat gain even with static calorie intake.