all of these intuitions are right, it's the stress, the environmental pollutants, the empty calories, the nutritional deficiencies, and, as you said, excessive

all of these intuitions are right, it's the stress, the environmental pollutants, the empty calories, the nutritional deficiencies, and, as you said, excessive hygiene and underexposure to pathogens particularly during childhood (even cesarian birth contributes to gut dysbiosis), overreliance on pharmaceutical drugs that do more harm than good, all in all a gross misunderstanding of what constitutes health and how the human body works