New research from the University of Florence reveals that men with large testicles are predisposed to drinking more, having higher blood pressure and suffering from heart disease. 

Giulia Rasterelli, who led the new study at the sexual medicine and andrology unit at the University of Florence, Italy, said to The Daily Telegraph: “Although it is generally assumed that testis size can predict reproductive fitness, our results indicate that this objective parameter can provide insights also on overall health and [cardiovascular disease] risk.”

"Further studies are needed for clarifying determinants and mechanisms of testis enlargement that... could mediate the increased incidence of major adverse cardiovascular events."

The study is surprising considering that larger testicles were previously seen as being an indicator of good reproductive health, but one theory mooted in the study is that men with diabetes and heart disease problems can have lower testosterone levels, and that the body may be trying to compensate for that by secreting higher levels of pituitary hormones. This can lead to an increase in testicle size.