B.Sc Dietetics

Candidates need to be from any stream of art/ Science/ commerce in 10+2 level. Minimum marks required is 50%. Some reputed colleges do conduct entrance exam. Admission process starts with application form and then according to merit the selection is made.

B.Sc Nutrition and Dietetics program is not available at Madurai Kamaraj University (DDE), Hence you can not do this. However P.G. Diploma in Nutrition & Dietetics (Only in Tamil Nadu) of one year course is available here. The eligibility criteria is as under.
Eligibility : A Degree in Science with Biology as one of the subject in +2 (XII Std.)

Colleges for B.Sc in nutrition and dietetics-
VLCC Institute of Beauty and Nutrition, Telangana, Hyderabad
VLCC Institute of Beauty and Nutrition, Bangalore
Mount Carmel College, Bangalore
Medvarsity, Bangalore
Colleges for B.Sc in physical education-
Mount Carmel College, Bangalore
Jain University, Bangalore.

Please refer to the link provided below for details regarding admission in Mount Carmel College, Bangalore. You should be able to download their brochure, which contains important details like last application dates, fee structures for various courses, etc. I am not too sure if this college offers courses in Nutrition and dietetics but you can find out by checking their brochure.

Yes, some universities conduct entrances for admission in B.Sc nutrition and dietetics such as Panjab Agricultural University, Delhi University, etc. to name a few. You will need to search out which university holds the entrance for the same.

I hope this link will help you
https://www.shiksha.com/medicine-health-sciences/dietics-nutrition/colleges/colleges-Pune.