The document discusses polygenic disorders, which are genetic disorders caused by more than one gene and influenced by environmental factors. They are difficult to study due to genetic variability. Two specific polygenic disorders discussed are Alzheimer's disease and diabetes/hypertension. For Alzheimer's, researchers are searching for biomarkers to detect the disease early before symptoms appear. For diabetes/hypertension, a study found that immune cells called eosinophils play an important role in regulating blood vessel function and their absence contributes to these conditions. Identifying the genetic factors for these disorders may help develop preventative measures and treatments to improve patient outcomes and quality of life.