Senior adults with higher levels of a specific protein in their blood have better cognitive function.<br />According to a new study, those same older adults might also be at lower risk for dementia.<br />According to UPI, about 6 million Americans are currently living with some form of dementia.<br />The protein, apolipoprotein E, is found in HDL, which also is known as "good cholesterol".<br />Earlier research also shows that apolipoprotein E has a "cardioprotective" effect, meaning it may protect your heart.