If you have high LDL (bad cholesterol), you may worry about having a heart attack or stroke. But that's not the only thing you should be worried about. Having high cholesterol means you could also be prone to memory problems, including Alzheimer's. According to experts, when cholesterol builds up in your blood vessels, there is less room to carry blood to the brain. Having high LDL also causes inflammation, which can damage cells throughout the body. So aim to keep your LDL low (below 100), to avoid future heart and memory problems.