take a look at the book "4 Hour Body" by Tim Ferriss, there in the chapter Improving Sex, sub-chapter: "Sex Machine I: Adventures in Tripling Testosterone"
I think in there the author, Tim Ferriss aged 34(?), mentions how he went from 2xx to 6xx in a very short amount of time, mainly by changing his nutrition.
Or it could be a coincidence since the number of test subjects was 1.
I like how the examine.com article sums it up:
> Although 'natural' (non-supplemental) methods of increasing testosterone are pretty weak and unlikely to build muscle mass, they tend to be related to pro-sexual effects (particularly libido) and exerting dominance
I think in there the author, Tim Ferriss aged 34(?), mentions how he went from 2xx to 6xx in a very short amount of time, mainly by changing his nutrition.