I suppose as long as phallic considerations are still on topic, this recent Science news article seems relevant.
Researchers have apparently discovered that infertility may be a risk for men with diabetes. When they performed analysis on the DNA of sperm from diabetic men, they discovered that the genetic material had degraded more in the diabetic group than in the control group.
They think that the higher blood sugar may lead to free radicals which destroy the DNA. I'm not certain how that mechanism would work, or why sperm are affected to such a degree. I'm curious what research will follow from this.
So . . . is this motivation to start or stop a low-carb diet?