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This is Dr. David
a vegan diet will help you loose weight and will help decrease chances for future cancers caused by obesity such as colon cancer and some other cancers.
a vegan diet wouldn't prevent all cancers.
vegan diet can help reverse some athrosclerosis plaques of your heart vessels.
you can be at risk for low iron or low B12 levels with a vegan diet, but these can be supplemented for.
let me know if you have other questions.