What if one day you wake up and you forget the conversation that you had during dinner the night before? What if you suddenly keep losing in a game that you mastered? What if you take longer time to perform a daily task? These might be some early symptoms of Alzheimer's disease (AD). Alzheimer's disease is the most common form of dementia that affects humans' memory, language, and behavior over time. The cause of AD is not very clear. Individuals are more likely to get the disease when they are in their old age and if they have relatives with the disease. The disease can also be caused by genes. Other factors that might also increase the risk are gender (a woman is usually more prone to the disease than a man) and previous exposure to head trauma. Many research have been done on the disease, but until today, there is still no cure for the disease. There are medicines available to slow the rate of they symptoms become worse, such as Doneprezil and Memantine. However, patients who take the drug will not get much benefit as they will not see a lot of difference. Beside the difficulty in its treatment, it is also hard to prevent AD. A health journal suggests to eat less fatty diet, increase antioxidants consumption, and maintain a normal blood pressure to prevent AD. To learn more about the disease, Alzheimer's Association has a wonderful website that provides many information about AD.