Flynn Effect and its reversal are both environmentally caused Decrease in cognitive scores among children in recent years
Secular declines in cognitive test scores: A reversal of the Flynn Effect
Dynamics of Obesity and Chronic Health Conditions Among Children and Youth
Generation Sick
Comparison of Cancer-Related Spending and Mortality Rates in the US vs 21 High-Income Countries
Cancer statistics
Cancer death rate increased by 21% since 1990, total cancer deaths by 75%
Acne Vulgaris A Disease of Western Civilization

The astonishing difference in acne incidence rates between nonwesternized and fully modernized societies cannot be solely attributed to genetic differences among populations but likely results from differing environmental factors.