Childhood obesity rates have risen in most developed countries, not just the United States. A study of both normal weight and overweight Swiss children found several factors associated with increased weight in children.
The amount protein as a percent of food intake was significantly higher in overweight children. Calories, carbohydrates and fat were not correlated with Body Mass Index (BMI), but protein was. Likewise, meat intake was significantly correlated with BMI.
Time spent watching TV and playing video games was also associated with increased BMI.