But that has been hard to prove. Studies of dietary fiber and colon cancer failed to find that fiber was protective, and studies of vitamins thought to protect against cancer failed to show an effect.
2
维生素b12：某些癌症与缺乏维生素b12相关联。
Vitamin B12: Deficiencies are associated with cancer.
3
维生素b 6：某些癌症与缺乏维生素b 6相关联。
Vitamin B6: Deficiencies are associated with cancer.
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