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The choice of simple sugars as the most over-consumed energy nutrient in the American diet is supported by various nutritional studies and dietary guidelines. Simple sugars, often found in sugary beverages, candies, pastries, and many processed foods, tend to be consumed in excessive amounts relative to the recommended limits for optimal health. This overconsumption is linked to various health concerns, including obesity, type 2 diabetes, and heart disease.

In contrast, while saturated fats and proteins are components of the diet that might also be consumed in excess, many health guidelines emphasize reducing saturated fat and moderating protein intake to balance overall nutrition. Complex carbohydrates, though a critical energy source, are generally consumed at more appropriate levels compared to simple sugars. Thus, simple sugars stand out as a concern due to their added caloric content and low nutritional value, leading to their designation as the most over-consumed energy nutrient in the American diet.