For example, redheads feel more pain. One study shows a mutation of the gene responsible for red hair may also control the way the brain regulates pain sensitivity.
If you fly off the handle, check your hands. A study in the Journal of Communications found if you have a smaller index finger than ring finger, you may be more likely to be verbally aggressive.
A 2010 study showed men whose index fingers were longer than their ring fingers were 1/3 less likely to get prostate cancer.
Height-challenged people may have an advantage. A study in the Western Journal of Medicine found the onset of chronic disease is often delayed in those who are shorter than average.
Your arm length could be a tell-tale sign of Alzheimer's. Women with arms less than 60 inches across may be 1 1/2 times more likely to develop the disease. Also, women with smaller calves could have a higher risk of stroke.
Finally, take a look at your finger and toenails. If the very base is purple or blue, it could indicate a heart or circulation issue.