Badzine: How do you choose the commercials you go for?
Lin Dan: First, I don’t choose a commercial only based on money issues. I must consider whether the product is suitable for me. Second, I don’t readily agree to do commercials for food or pharmaceuticals since people regard me as their hero and idol, and I must be responsible for them. That’s also the reason why I am so cautious in choosing products I endorse
Source :http://www.badzine.net/2013/08/superstar-lin-dan-talks-to-badzine/