The study showed that Alzheimer's brain changes progressed up to 20 times faster in women with Alzheimer's disease and co-occurring alpha-synuclein pathology compared to men. Alpha-synuclein is a protein typical of Parkinson's disease, which can also occur in patients with Alzheimer's disease. Research has shown that in some patients with Parkinson's disease, hidden signs typical of Alzheimer's disease appear even before the onset of dementia[1]. In elderly patients with Parkinson's disease, diagnosed around the age of 80, amyloid protein, which is characteristic of Alzheimer's disease, is also often found[1]. Experts hypothesize that in patients with Parkinson's disease, amyloid accumulates in the brain for a shorter period of time, which may lead to faster development of memory and thinking problems[1]. These findings open new questions about the relationship between the two diseases and indicate the need to monitor changes in the brain already in the earlier stages of the disease.