You just need to qualify entrance exam.  The criteria is:

Pass with min 50%- 60% aggregate marks (Varies university to university)in 10+2 with English, Physics, Chemistry and Biology or Biotechnology.

I am enlisting some good colleges/institutes for doing Bsc in Nutrition and Dietetics:

Lady Irwin College, New Delhi,

The Maharaja Sayajirao University of Baroda

Institute of Home Economics DDPHN)

Lovely Professional University, Jalandhar, Punjab

Chaudhary Sarwan Kumar Himachal Pradesh Agricultural University, Palampur, Himachal Pradesh

Sri Venkateswara University College of Science Tirupati, Andhra

Public Health Foundation of New Delhi, Delhi NCR

IIS University, Jaipur, Rajasthan

Sant Gadge Baba Amravati University, Amravati, Maharashtra

Arts, Science & Commerce College, Kinhavali Thane, Maharashtra

Hey Qureshi,

if you want to do graduation then the Eligibility Criteria is:

Pass with min 45%- 60% aggregate marks in 10+2 with English, Physics, Chemistry and Biology or Biotechnology). (Varies university to university)

here are some colleges to do Bsc in food and nutrition 

Lady Irwin College, New Delhi,

The Maharaja Sayajirao UYniversity of Baroda,Vadodara

Lovely Professional University, Jalandhar,

School of Science & Technology, Ahmedabad University

Bangalore University, Central College Campus, Banglore

University of Bombay, Mumbai

All the best!