Want to Be a Manly Man? UCLA Research Says; "Eat Walnuts"

While I prefer to document correlations, there is a whole crew seeking to measure "causal effects".  Reading most of these papers, I would describe them as recovering "casual effects".  But, today I found an exception.   This blurb   highlights some exciting UCLA research.

Last year, experts at the University of California Los Angeles also found young men in their twenties and thirties who ate walnuts every day increased their sperm count and boosted their fertility. 

This raises an interesting marketing question. While I watch NBA basketball games on TV, why don't I see more walnut ads next to the beer and fast food ads?   Think outside the bun!

For those who want to read the real paper;

Robbins, Wendie A., Lin Xun, Leah Z. FitzGerald, Samantha Esguerra, Susanne M. Henning, and Catherine L. Carpenter. "Walnuts improve semen quality in men consuming a Western-style diet: randomized control dietary intervention trial." Biology of reproduction 87, no. 4 (2012): 101.