1980s CE
During the 1980s, coffee became associated with many diseases, leading to a decline in consumption

Due to findings that associated coffee with different health issues, including pancreatic cancer, birth defects and heart problems, the reputation of coffee was hit hard during the 1980's. While many independent studies pointed out flaws with the anti-coffee findings, the damage had been done and an increasing number of consumers chose decaffeinated alternatives or gave up coffee completely. Between 1977 and 1988, the percentage of Americans who drank coffee decreased from 58% to 50%.

Source: Pendergrast, M. (1999). Uncommon grounds. Basic Books.