Exercise and a healthy diet are the best way. Eating foods high in antioxidents such as blueberries and brocolli are said to help prevent against cancer. Also avoiding the obvious health risks such as smoking will lessen your chance of getting cancer.
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Forgiveness towards oneself and others is an integral part of cancer prevention. There are some techniques which can be used on a daily basis like an internal cleanse (much like brushing one's teeth daily). Here are a few options: