It’s no joke. Those laugh lines might just reveal the health of your bones. A recent study at Yale School of Medicine has found that there is a connection between the health of your bones and the laugh lines around your mouth. Results show that for women in their 40s and 50s, the worse their skin winkles are, the lower their bone density is. The researchers gave each woman a score for her face and neck wrinkles based on the number of sites with wrinkles and on the depth of the wrinkles. They measured the firmness of the skin on the women’s foreheads and cheeks. Then they measured their bone densities with an X-ray analysis. Bones and skin cells share common building blocks called collagens, and they change as we age. Paying attention to laugh lines could be helpful in identifying postmenopausal women at risk for fractures at only a glance and without the need of expensive tests.