Hello.
selecting any course for future depends upon your interest if your interest is in any course and you want to go for this then definitely the future is good in this because if you are interested in this and you are going then your passion will be completed towards your goal and then definitely you will have a bright future, yes BSc in biotechnology is good for future for only those who are interested in this, if talking about nutrition then as you can see that in day to day there is a season of disease and there is a need of a nutrition who can guide an individual to be nutrientfull so that person could prevent themselves from disease by following the tips.
Best of luck.