Role of Caffeine Intake on Erectile Dysfunction in US Men: Results from NHANES 2001-2004
David S. Lopez ,
Run Wang,
Konstantinos K. Tsilidis,
Huirong Zhu,
Carrie R. Daniel,
Arup Sinha,
Steven Canfield

PLOS

Published: April 28, 2015
DOI: 10.1371/journal.pone.012354

Abstract
Objectives

Caffeine is consumed by more than 85% of adults and little is known about its role on erectile dysfunction (ED) in population-based studies. We investigated the association of caffeine intake and caffeinated beverages with ED, and whether these associations vary among comorbidities for ED.

Material and Method

Data were analyzed for 3724 men (≥20 years old) who participated in the National Health and Nutrition Examination Survey (NHANES). ED was assessed by a single question during a self-paced, computer-assisted self-interview. We analyzed 24-h dietary recall data to estimate caffeine intake (mg/day). Multivariable logistic regression analyses using appropriate sampling weights were conducted.

Results

We found that men in the 3rd (85-170 mg/day) and 4th (171-303 mg/day) quintiles of caffeine intake were less likely to report ED compared to men in the lowest 1st quintile (0-7 mg/day) [OR: 0.58; 95% CI, 0.37–0.89; and OR: 0.61; 95% CI, 0.38–0.97, respectively], but no evidence for a trend. Similarly, among overweight/obese and hypertensive men, there was an inverse association between higher quintiles of caffeine intake and ED compared to men in the lowest 1st quintile, P≤0.05 for each quintile. However, only among men without diabetes we found a similar inverse association (Ptrend = 0.01).

Conclusion

Caffeine intake reduced the odds of prevalent ED, especially an intake equivalent to approximately 2-3 daily cups of coffee (170-375 mg/day). This reduction was also observed among overweight/obese and hypertensive, but not among diabetic men. Yet, these associations are warranted to be investigated in prospective studies.

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More:
http://journals.plos.org/plosone/article...al.pone.0123547

And, assuming you have no medical contra-indication:

caffeine increases stamina, helps asthma, improves memory, decreases the risk of Alzheimers, helps asthma, ....................
More: http://www.caffeineinformer.com/top-10-c...health-benefits