This article from the BBC may somewhat overstate the case but exercise, diet and weight control are not only good for your mental health but for your physical health.
“about a third of the 12 most common cancers in high-income countries and about a quarter in lower income countries could be prevented through diet, exercise and weight control.”
Estimated percentage of cancers that could be prevented
US UK Brazil China Mouth, pharynx & larynx 63 67 63 44 Oesophagus 69 75 60 44 Lung 36 33 36 38 Stomach 47 45 41 33 Pancreas 39 41 34 14 Gallbladder 21 16 10 6 Bowel 45 43 37 17 Liver 15 17 6 6 Breast 38 42 28 20 Endometrium (womb) 70 56 52 34 Prostate 11 20 n/a n/a Kidney 24 19 13 8 12 cancers combined 34 39 30 27 All cancers 24 26 19 20 World Cancer Research Fund
Medicynical note: No prospective study of this is possible and no one knows how early one must start behaving to have a salutary effect on cancer prevention or life expectancy. One can take solace in the fact that following the recommendations should make you feel good, even if it may not have the ultimate beneficial effect.
It shoul
d be noted that the outcome benefit is not dependent on use of supplements, omega 3 oils, and other unproven remedies.
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Medicynic 
I’m a firm believe diet is everything in cancer prevention. But define diet? define a healthy lifestyle? Everyone has their own version. If you eliminate processed foods and sugars from your diet, you’re in better shape than most people in this country. This is a great video on the bitter truth of sugar and why it’s the root of cancer today, http://www.youtube.com/watch?v=dBnniua6-oM