The good news and the bad news....
The Good News:
There is "convincing evidence" that breastfeeding protects the mother against breast cancer;
There is "probable evidence" that breastfeeding protects the child from obesity later in life;
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Maintaining a healthy weight (a body mass index of 20-25) is one of the best ways of preventing cancer.
The Bad News:
High consumption of red meat and processed meat, including ham and bacon, is associated with a modest increased risk of colorectal cancer - consume processed meats sparingly;
Dietary supplements, including vitamins, are not recommended for cancer prevention;
Evidence that alcohol is a cause of cancer "stronger now than ever before".