Even a simple google search brought me to this article from 2011, on the nytimes website.

https://www.nytimes.com/2011/05/08/world/asia/08food.html

In recent weeks, China’s news media have reported sales of pork adulterated with the drug clenbuterol, which can cause heart palpitations; pork sold as beef after it was soaked in borax, a detergent additive; rice contaminated with cadmium, a heavy metal discharged by smelters; arsenic-laced soy sauce; popcorn and mushrooms treated with fluorescent bleach; bean sprouts tainted with an animal antibiotic; and wine diluted with sugared water and chemicals.

Even eggs, seemingly sacrosanct in their shells, have turned out not to be eggs at all but man-made concoctions of chemicals, gelatin and paraffin. Instructions can be purchased online, the Chinese media reported.

Scandals are proliferating, in part, because producers operate in a cutthroat environment in which illegal additives are everywhere and cost-effective. Manufacturers calculate correctly that the odds of profiting from unsafe practices far exceed the odds of getting caught, experts say. China’s explosive growth has spawned nearly half a million food producers, the authorities say, and four-fifths of them employ 10 or fewer workers, making oversight difficult.

I would think one could tell the difference between a egg with no nutritional value and one that does, but who knows. I would bet its easy to test for but people like donald trump only care about profit, not lives.

Does indeed seem to be a problem in the indian market.

https://www.youtube.com/watch?v=GqWCyOxQL3s