If you are really careful you can stick with major brand names, instead of food from street markets, but rest assured that safety checks are extremely stringent. You are much more likely to get safe Chinese food in hong kong than safe Chinese food in the USA.
Is it easy to move from HK to U.S.?
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Nothing is perfect. Food from anywhere can be toxic.
Last year, Hong Kong was ranked #1 in life expectancy.
There should be a reason for that. I do not think all of them purchase food from foreign countries.
Have you seen the news today? The company that produced the Jilongyu brand may have obtained their materials from toxic oil (digouyou).Indeed the life expectancy in Shanghai is also over 80, but you can see that most of the city is in a mess.