Dementia is a disease in which the patient has memory loss. Thinking and reasoning ability becomes reduced. Some other symptoms of this disease are tremors, imbalance and problem in eating food. It puts an adverse impact on the daily life and functioning of the affected person. This condition usually occurs in old age after the age of sixty-five. The disease cannot be cured but its risk can be decreased by making lifestyle changes. Exercises help in improving the condition of the patient and doing daily activities. Intellectual activities like reading help in improving mental function. Eat vegetables and nuts. Following is a detailed guide on how to prevent dementia.