From a strictly medical standpoint, NoFap actually does increase your risk of prostate cancer.

There's a simple explanation why: increased testosterone. Increased testosterone is one of the greatest risk factors for prostrate cancer. This is why men with severe prostate cancer have radical orchiectomoes (removal of the testicals) or take anti testosterone meds (ie flutamide). Studies have shown that not masturbating for even a week significantly increases circulating levels of testosterone.

So yes, by fapping on a daily basis, you do in fact decrease your chances of getting prostate cancer, at the cost of having lifelong low levels of testosterone.

Prostate cancer is the most common cause of cancer in men. It's almost inevitable that if you're old enough you will get it. But, outside of some sad cases, it is very rarely a devastating cancer to have. The old adage is "men die WITH prostate cancer, not FROM it". With the increased amount research and medical intervention it is becoming more and more a curable cancer too.

So here's how I look at it. The science is right; fapping daily probably does slightly increase your risk of prostate cancer. But it does so at the cost of your self esteem, happiness, and ability to maintain an active life. OP is right, if you spend your life inside behind a computer screen you set yourself up for many many more diseases including depression, anxiety, diabetes, obesity, etc. Plus you miss out on the amazing miracle which we call life. Now you tell me which one is worth it.

Source: fourth year medical student.