Yelling about how healthy its products are and how good they are for the human body. Actually, it's not. We young people still have the ability to distinguish these things, but the old people at home are different. They usually think that everything is right as long as it is broadcast on TV.
Just say they usually watch. The key point is that the elderly at home will be fascinated by various health programs, products will be cheated, and news that there is something wrong with imitating diet therapy can be found everywhere. Another headache is that many old people keep persuading, and it is difficult to tell them what they can't believe and how to persuade them not to believe.
Because the elderly at home are well-intentioned, if you directly say that what he saw is useless and what he bought is cheated, it will hurt them and make them feel bad. Without a good word, they will become old children when they are old and need to be taken care of like children.
In this case, you can tell them well and understand them well, and don't blame them too much for being cheated in buying products. Just explain patiently. I believe that the old man is not unreasonable and does not listen to advice. After that, you can find more formal and desirable health programs to show them. So they can still watch what they want, and you don't have to worry that they will be cheated.