According to Nikkan Spa, a 28 year-old with the alias “Yuichi Ito” was able to lose nearly 9 pounds in two months, simply through watching his diet and flogging his log between three and five times a day. (Supposedly, Ito's record was seven times in a single day.)
While in high school, Ito played baseball, but gained weight after he graduated. The 5 foot 5 inch Ito ballooned to 167 pounds, which would be considered overweight by Japanese standards. Ito decided that a good way to drop the excess pounds was to cut calories and have more sex. With himself.
“I read online that pleasuring oneself was the same as running 200 meters,” said Ito. “Without a girlfriend, the only way I could become thin was through masturbation!”
So is the so-called “fap diet” a good idea? No… Not at all. Says at doctor, via Kotaku:
“The issue with the effectiveness of this diet is that while you are exhausting your body, you are not consuming calories by using physical strength,” said Satoshi Yoshijima, a dermatologist and doctor of internal medicine in Tokyo. Dr. Yoshijima also added that excess self-stimulation can adversely impact hormone levels.