![]() This is called early- or young-onset Alzheimer's disease and it can affect people from around the age of 40. Around 1 in 20 people with the condition are under 65. The likelihood of developing Alzheimer's disease doubles every 5 years after you reach 65.īut it's not just older people who are at risk of developing Alzheimer's disease. AgeĪge is the single most significant factor. Increased riskĪlthough it's still unknown what triggers Alzheimer's disease, several factors are known to increase your risk of developing the condition. The first symptoms may be problems with vision or language rather than memory. In more unusual forms of Alzheimer's disease, different areas of the brain are affected. The first areas usually affected are responsible for memories. Over time, different areas of the brain shrink. Levels of one neurotransmitter, acetylcholine, are particularly low in the brains of people with Alzheimer's disease. The other protein is called tau, deposits of which form tangles within brain cells.Īlthough it's not known exactly what causes this process to begin, scientists now know that it begins many years before symptoms appear.Īs brain cells become affected, there's also a decrease in chemical messengers (called neurotransmitters) involved in sending messages, or signals, between brain cells. ![]() ![]() One of the proteins involved is called amyloid, deposits of which form plaques around brain cells. Alzheimer's disease is thought to be caused by the abnormal build-up of proteins in and around brain cells.
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