"There's an incredibly important link between a man's health and sexual performance," Lamm, an assistant professor of medicine at New York University, tells WebMD.
Lamm's recent book, The Hardness Factor, is a flashing neon sign pointing to that link.
It is well known that heart disease, as well as diabetes, depression, obesity, substance abuse, and many other health problems can quash erections. Getting an erection isn't crude mechanics, like inflating a balloon. It's a complex process in which blood vessels, muscles, hormones, the nervous system, and the psyche all work together. If one part isn't working well, it affects the whole apparatus.
This isn't another book touting Viagra, like Lamm's The Virility Solution, published in 1998, the same year Viagra hit the market. Lamm says The Hardness Factor is not for men who are already dealing with erectile dysfunction (ED). His aim is to convince young, healthy men to take better care of themselves by speaking to their penises.
"If you want a 28-year-old man to stop smoking, let him read the book," Lamm says.
Heart Health and Sexual Health
Others in the field of sexual medicine agree that erectile function can be closely related to overall health, especially heart health.
"When men who are otherwise healthy ask what they can do to prevent ED, certainly the very things we recommend for cardiovascular fitness are exactly the same things they should be doing," Drogo Montague, MD, a urologist at the Cleveland Clinic, tells WebMD.
To get erect, the penis must become engorged with blood. Atherosclerosis, a condition in which fatty deposits build up inside arteries, may restrict blood flow to the penis and cause erection difficulties. Diets high in fat and cholesterol, high blood pressure, obesity, diabetes, and smoking are the main causes of atherosclerosis.
"It's very appealing to say that if you don't have those unhealthy factors in your lifestyle, then you're less likely to develop erectile dysfunction," says Ira Sharlip, MD, a urologist at the University of California, San Francisco.
"There are pretty strong suggestions that those things are true," he tells WebMD.