Eating Too Much Protein Makes Pee Pollute the U.S.蛋白摄入多，尿液污美国

In the U.S.， people eat more protein than they need to. And though it might not be bad for human health， this excess does pose a problem for the country’s waterways. The nation’s wastewater is laden with the leftovers from protein digestion： nitrogen compounds that can feed toxic algal blooms1 and pollute the air and drinking water. This source of nitrogen pollution even rivals that from fertilizers washed off of fields growing food crops， new research suggests.

美国人蛋白质吃得太多，超过身体所需。（剩余5051字）