Using data from 489,706 men and women taking part in the NIH-AARP Diet and Health Study, researchers analysed information from self-administered questionnaires of demographics diet and lifestyle. The researchers followed the participants for an average of 10.5 years and found approximately 16% of participants drank four or more cups of coffee per day.
Compared with non-drinkers, those who drank at least 4 cups of coffee daily and had a lower risk of colon cancer (particularly proximal tumours). The data revealed that drinking 4-6 cups daily lowered colon cancer risk by 15% compared to non-drinkers. Among those who drank at least 6 cups daily, the risk was 24% lower.
The research team noted that drinking decaffeinated coffee appeared to have some beneficial effect, although the benefit was not as strong. Interestingly, drinking tea had no observable effect.
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Source: Caffeinated and decaffeinated coffee and tea intakes and risk of colorectal cancer in a large prospective study
Other posts on coffee studies:
- coffee may protect against endometrial cancer
- potentially inhibiting some breast cancers
- preventing prostate cancer
- reducing the risk of brain tumours (many studies covered in this post... you'll find this study about halfway down
- coffee can help prevent Alzheimer's disease
- and another study protecting against Alzheimer's disease
- benefiting blood sugar and fat metabolism and another one on its anti-diabetic effects
- protecting DNA from free-radical damage and assisting in weight loss
- coffee may prevent fatty liver fibrosis