Hello aspirant!
Hope you are doing well!

You would be happy to know that a commerce background student can qualify to be a nutritionists. There are several courses available online that can help you to be a certified nutritionist.
VLCC, INFS etc.
Make sure you have dietary knowledge as well as knowledge regarding physiology to get a deeper insight on human physiology.

The commerce background student can not pursue B.sc In Nutrition & Dietetics since it requires an aggregate of 50% score in higher secondary education from a recognized board or university with PCB/ life sciences