For non-medication, the best treatment is: exercise + losing weight (high
fiber and low fat diet). let your parents use Olive oil instead of corn oil.
Olive oil is a lot more expensive in China than in the US. not many people
knows Olive Oil is a very good thing to bring back because almost everything
else is cheaper in China. It costs about 40RMB/800ml (if i remember correctly)
in China and about $10/gallon in the US. Costco is cheaper. The price is
strange probably because the market is small