A substance known as fibroblast growth factor is one of the factors that promotes cerebral arteriosclerosis. The amount of this substance in the brain increases many times after a meal compared to before a meal. Under the body's natural regulatory processes, it usually returns to normal levels quickly from a higher state. However, if one overeats for a long period, fibroblast growth factor accumulates in the brain, causing hardening of the cerebral arteries and leading to diseases such as senile dementia. The more an elderly person eats, the greater the workload on their organs and tissues, the more reactive oxygen species that cause damage to human cells and aging are produced, and the faster the aging process of the body becomes.