1.Elderly people should have a light dinner consisting of grains and vegetables. This will provide sufficient protein, vitamins, and fiber, promoting digestive health and preventing constipation. 

2 .It is important to avoid greasy and fatty foods, as these can lead to atherosclerosis and coronary heart disease. Eating dinner earlier allows for urine excretion, preventing calcium accumulation and urinary stone formation. 

3.Alcohol should be avoided during dinner, but if consumed, sleep should be delayed for 3-4 hours. Green tea can help alleviate discomfort caused by alcohol, while milk protects the stomach.

4. Lastly, fatty and sweet foods should be avoided to prevent conditions like obesity and high cholesterol.