82 years old male had rectal polyps removed 11 years ago. He has not had any cancer since then.
He works in his plum field for about 1 hour in the morning including climbing up and down a ladder for pruning and he earns about 2000 steps. After that, he goes to a supermarket by car but parks as far as possible to walk more, earning 1500 steps. Then he goes out to take a walk for about an hour including fast walking, earning about 4500 steps. He walks about 8000 steps a day.
To prevent cancer, 7000 steps walking a day including 15 minutes activities of moderate intensity is effective. It has turned out that more than 7000 steps including 15 minutes moderate intense activities activate the natural killer (NK) cells which kill cancerous cells, resulting in preventing the increase and enlargement of the cancer.
Cancers which are considered as preventive in this research are:
(1) Colon cancer
(2) Lung cancer
(3) Breast cancer
(4) Endometrial cancer