M.Sc

After B.Sc. You can go for M.Sc. Or other courses and then Ph.D. if you want to be a hardcore researcher. For which you have to start preparing for NET/SET (SLET) competitive exams as CSIR conducts this NET twice in a year. Just remember that this is the toughest and tricky kind of exam. But once qualified, life will be easy and smooth, as you will be getting fellowship worth 25,000 Rs. Per month. Most popular colleges for doing M.Sc. Are:
University of Hyderabad-School of Life Sciences, University of Mumbai-Institute of Chemical Technology, National Dairy Research Institute
Rajiv Gandhi Center for Biotechnology
School of Allied Medical Sciences, Lovely Professional University
Delhi Technological University-Department of Biotechnology, Indian Institute of Technology-Department of Biochemical Engineering & Biotechnology, Delhi University.

After B.Tech, if you are interested in Higher Studies or research in the same stream, then you may go for M.Tech. Else, MBA would be a good option. You should have 55% marks in B.Tech/BE and a valid score of GATE. I am enlisting a few good colleges for M.Tech : IIT Roorkee, IIT Guwahati, DTU, IIT Varanasi, IIT Dhanbad, NIT Surathkal, NIT Tiruchirappalli, NIT Warangal, NIT Calicut, Lovely Professional University, Jalandhar, Punjab, College of Engineering, Anna University, DTU, VIT, BITS, IIIT Hyderabad, IIEST Howrah, College of Engineering Pune, Jadavpur University, IIIT Allahabad, Anna University
If you are not interested in learning technology anymore, only then you should pursue MBA. You should have cleared anyone entrance test (such as CAT/MAT/XAT/NMAT/CMAT/GMAT/NEST) and should also have a min of 45% to 55% in your Bachelors. You can do MBA in any specializations of your interest. Some Good Colleges are:IIMS, XLRI.

Always remember Masters in any subject will always add the feather in your cap. You will learn many things. Diverse job opportunities exist in front of nutritionists and dieticians in India. Both Government and private sector job opportunities are available in front of them. Talking about the Government sector, some of the well-known recruiters include-
Government hospitals
Community health centres
Government Schemes and Missions (like ICDS, NHRM etc. )
Government Organizations (like FNB, ICMR, Public Health Foundation etc. )
Government R&D units
Government Nursing homes
Government Nutrition Education Institutes
Coming to the private sector, some of the well-known recruiters include-
Private clinics and hospitals
Nursing homes
NGOs
Food products manufacturing firms
Pharmaceutical firms.