1, my friend also reported this, because I haven't finished learning, and I can't answer your question yet. But we are junior college students in this major. When we come out to work, we usually work as nutritionists or nutrition lecturers. As for the feed regulator you mentioned, it seems that you can't.
As for this major, I think its development prospect is very good, because there is a shortage of nutritionists in China. But at present, the country is not very standardized, and the market is still in a period of chaos. Many nutritionists have to be linked to sales. However, I think with people's attention to nutrition and health, this major will have a good development in the future, depending on whether you can accept the reality of the current nutrition industry.