A body composition scale analyzes how electrical signals flow through your body, estimating how much of your total weight is fat-free mass compared to body fat. You may not always get every answer ...

Your body produces it when your skin is in the sun or when you eat vitamin-D-rich foods. It can be hard to notice a vitamin D deficiency because it sometimes yields no symptoms. One study found ...

Am J Phys Anthropol. 1980 Jul;53(1):93-100. doi: 10.1002/ajpa.1330530113 Heymsfield SB, Gallagher D, Mayer L, et al. Scaling of human body composition to stature: new insights into body mass index. Am ...

To ring in the new year, I booked a body composition analysis at the athletic club Life Time. After I got a scan of my muscle mass and body fat, a personal trainer walked me through the results ...