Eligibility for MSc clinical Nutrition as per the Official notification:

Candidates for admission to the Master's Degree, CLINICAL NUTRITION and FOOD DEGREE COURSE IN SCIENCES UNDER ALLIED HEALTH SCIENCES

The student should have passed the degree in any of the following courses from a recognized university:

Bachelor of Nutritional Dietetics and Food Service Management / Food and Nutrition Sciences/ Clinical and dietary nutrition Food and dietetic service management / Home Sciences (with a specialization in Nutrition and Dietetics) / Human Sciences (with a specialization in Nutrition and diet).

There is no mention of BSc Life science so you aren't eligible based on that (although not clearly specified that BSc Life science is ineligible but also not mentioned) not by percentage.

You can see the PDF by using the link below:

https://www.amrita.edu/sites/default/files/faculty-of-medical-science/allied-health-sciences/m-sc-programmes/msc-clinical-nutrition-and-food-science.pdf?width=1100&height=800&iframe=true

I hope this answer helps. All the very best for your future endeavors!