…forget the scale or how your jeans are fitting, just measure your neck! Because your stomach can get bigger or smaller depending on when you last ate or hit the bathroom, and how much sodium you’ve ingested. Your neck circumference isn’t affected by those things, so it’s a more accurate indicator of everything from heart disease to diabetes. So what’s a healthy neck size? For guys, anything under 16-and-a-half inches. A woman’s neck should be less than 14 point 2 inches around. If it’s larger, talk to your doctor, because it’s now seen as a health risk factor.