In the figure above TC stands for total cholesterol and TG for triglyceride. The figure shows that the men’s cardiovascular scores improved.
Being a rich source of L-arginine, it’s believed that this factor in the pistachio may have influence on the results of the study. This amino acids dilates the blood vessel in the penis. The researchers also suspect that pistachio nuts contain substances that inhibit blood clotting and therefore make the blood thinner.
The research is controversial however. One criticism of the researchers is that they did not use a control group. [Int J Impot Res. 2011 Jul; 23(4): 180.] It’s quite possible that the improvement in sexual functioning was due to the placebo effect.
Impotence vs. Pistachios