Although the areas where nerve destruction has occurred will never return to normal, the progression of the disease can be controlled by preventative measures in the early stages. However, in stage III and above, it is almost impossible to prevent the progression. Prevention of heart disease is prevention of dementia. “Senile plaques and neurofibrillary tangles are like protein garbage in the brain. If you live for a long time, you will accumulate this protein garbage in your brain.” But some people develop Alzheimer’s disease, while others do not. Why is this? “Heredity is one factor, but lifestyle is thought to play a major role. This is because it is very important to improve blood flow. If the brain is well nourished by blood flow, metabolism runs smoothly and abnormal proteins that have not yet been deposited can be expelled from the body. Destroyed brain cells will not be restored, but the remaining brain cells will do their best to increase the number of synapses and compensate for the function of the destroyed brain cells.” In fact, in the United Kingdom, where there were many heart disease patients, policies such as reducing the number of smokers to about 1,300 yen per pack of cigarettes to prevent heart disease and encouraging the baking industry to reduce salt by 10% have resulted in a 20-30% reduction in dementia in people over 75 years of age in the past 20 years. The motto “Prevention of heart disease is prevention of dementia” has even been adopted. “Prevention of lifestyle-related diseases, such as moderate exercise, a well-balanced diet, and not being overweight, is directly related to the prevention of dementia. In addition, taking a walk along an unfamiliar street is also effective. In the olfactory cortex, there are lattice cells, which function like a GPS to recognize how far and how long you have traveled to get from point A to point B. By repeatedly going down an unfamiliar path and returning home, we can activate the cells.” “Nevertheless, once the disease reaches Stage III, there are so many cells that have been destroyed that trying to compensate for function using only the remaining cells would be too much of a burden, and the remaining cells would also break down,” he said.   Three years from now, one in five elderly people will have dementia. Japan has the world’s highest ratio of dementia to the total population. The Ministry of Health, Labor, and Welfare estimates that as of 2020, there will be approximately 6 million people aged 65 or older with dementia, and predicts that by 2025 there will be approximately 7 million. This figure is one out of every five elderly people. This is the highest percentage of the total population among the 35 developed countries in the Organization for Economic Cooperation and Development (OECD), due in part to the aging of the population. The only way to prevent it is to find it in its earliest stages. However, until now, cognitive function tests have only been able to make a diagnosis at stage III or above. Various studies are being conducted to somehow detect it in the “very” early stages. One such company is MIG Corporation (Brain100 studio program), of which Mr. Takashima is a co-founder, which conducts “spatial navigation brain function measurement” using VR goggles to identify the “early stages” of brain function breakdown. Cognitive disorders are no longer a problem for anyone else. Dementia is no longer something that is only a matter for older people, and we can only hope that a preventive drug will be developed as soon as possible. But first, we need to review our daily lives.