There may be many reasons for the elderly to buy health care products, such as advertising, physical discomfort or listening to other people's advice. If you want the elderly to stop buying health care products, you can consider the following aspects:

1. Give a scientific explanation: tell the elderly some relevant medical knowledge. For example, some diseases can only be effectively alleviated through examination and treatment in regular hospitals.

2. Help make a reasonable diet plan: A balanced diet is one of the most basic ways to keep healthy. Helping the elderly to make a nutritious diet plan can reduce their desire to buy health care products.

3. Encourage participation in outdoor activities: Appropriate exercise can enhance physical fitness, improve immunity, and at the same time make the elderly feel happy and relaxed, thus reducing their dependence on health products.

4. Rationally guide the consumption concept: educate the elderly to establish a correct consumption concept, clarify what they really need, and avoid being misled by merchants.

In short, give scientific advice and guidance to the elderly as much as possible, while respecting their wishes and choices. When necessary, you can take the elderly to professional hospitals or health care products institutions for consultation, learn more about relevant information, and make reasonable plans according to the actual situation.