The latest research results show that people with lower levels of high-density lipoprotein cholesterol in the blood are more likely to develop memory defects than those with higher levels, and the former is 27% more likely to develop memory defects than the latter. At the same time, high-density lipoproteins Cholesterol can transport blood lipids in blood vessels to the liver for treatment, effectively preventing heart disease and other cardiovascular diseases, while low-density lipoprotein cholesterol will transport blood lipids in the liver to blood vessels, causing disease. From this, it can be inferred? ['High cholesterol content is harmful to human health.', 'People with lower blood lipids are generally healthier.', 'High-density lipoprotein cholesterol can lower blood lipids.', 'People with memory deficits have low levels of high-density lipoprotein cholesterol in their blood.']