hi,

In majority of post graduate courses in India there is no age limit , you can certainly enroll for m.sc course in nutrition and dietetics after completing your bachelors course. the eligibility criteria is Candidate must complete Graduation in relevant discipline with minimum 50% marks in aggregate from a recognized university. due to covid 19 pandemic general regular degree courses are processing in online mode. you have to apply to the colleges for admission.

however the institute which offer m.sc in nutrition and dietetics in distance education  mode is as follows:

Indira gandhi national open university

vidyasagar university