What are the causes for the high volume of dysfunctionality in America?

I have been researching several categories in America and here is what I found after rounding the numbers:

44 million are diagnosed with a mental disorders
117 million have one or more debilitating chronic disease
217 million adults are overweight and obese
13 million children and adolescents ages 2–19 are obese.
17 million are diagnosed with AUD (alcohol use disorder)
24 million needed treatments for illegal drug abuse

The numbers from the categories do overlap, regardless, the stats still seem to be showing that the majority of the American population are dysfunctional in one or several ways.

Can you provide me with some peer-reviewed studies that help explain the cause for this dysfunctionality? Philosophical peer-reviewed explanation are also welcomed.

If you would like, you too can share your amateur opinion.