2, the elderly are not picky about food, eat everything, and fruit is constant all year round, which is actually a good diet. Modern medicine has confirmed that eating some eggs properly in the elderly can enhance memory and prevent the occurrence of Alzheimer's disease; Eating some apples properly can cure anorexia in the elderly, because anorexia is related to zinc deficiency. If you eat an apple after a meal, you can adjust the zinc content in your body and increase your appetite.