Amyloid proteins are misfolded proteins that can aggregate into fibrils, forming abnormal structures in the body. These proteins are typically produced during normal cellular processes but can become problematic when they misfold and accumulate, leading to various diseases. One of the most well-known conditions associated with amyloid proteins is Alzheimer's disease, where amyloid-beta plaques build up in the brain, disrupting communication between neurons. Other diseases linked to amyloid proteins include amyloidosis and Parkinson's disease, highlighting the importance of understanding these proteins in medical research and treatment.