Hello Sabila,
If you are interested in doing nutrition and dietics and wants to pursue a future then there are few colleges in Delhi university that are well known for this field.

• Lady Irwin college Delhi university
  
• Institute of home economics Delhi university.
  

You have to take admission in home science hons for doing nutrition and dietics.
Initially You have to study five main subjects of this fields but ultimately you have to choose a subject you are interested in and you'll be given that subject according to the merit list.
I hope this helps.
All the best for the future!!

Nutrition and dietics courses may be found on course brochures of colleges having fitness based courses, also some private medical colleges too offer such courses. Try getting information on RCAS Coimbatore , KCC Kodaikanal. These colleges may have this course. Hope this helps!