You should eat light food, and eating more fruit is also good. Also, don't let the elderly be stimulated, such as some words or actions, because blood pressure will rise when stimulated. Usually, as upstairs said, avoid some quick movements, such as standing up suddenly, or squatting down, then turning your head and not facing the sun for too long. The sun has ultraviolet rays, which sometimes make the old people dizzy. That's all I know. You can consult a friend who is a doctor. Wish you good health. . .