The genetics of China's pig population has been completely transformed in large part because imported pig breeds produce leaner meat.

由于进口猪的品种能够生产更瘦的猪肉，中国庞大人口的遗传基因已经很大程度上被完全改变了。

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'When they add chemicals to food, they're looking to make meat leaner or vegetables bigger so they can make more money,' Mr. Sang said.

桑立伟说，他们往食品里加化学添加剂，是为了让瘦肉更瘦或蔬菜长的更大，这样就能赚更多钱。

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For meat dishes, look for leaner cuts, such as skinless chicken breasts, Turkey burgers, pork loin and beef sirloin.

荤菜要选瘦肉，比如去皮的鸡胸肉、火鸡汉堡、猪腰肉和牛里脊肉等。

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Sir Bob May, the president of the Royal Society, said he hoped research into GM animals would be funded primarily by public sources so that it could meet the needs of developing countries, rather than being driven by the desires of agribusiness for leaner meat and cheaper food.

BBC: GM meat '10 years away'

The chemical can make meat leaner, but can also be the cause of heart palpitations, diarrhoea and muscle tremors.

ECONOMIST: Food safety in China