Hi,

The diploma course in nutrition at Ignou  1 year diploma in nutrition and health education. Its eligibility is  candidate should have passed 10+2 . The fee for this course is around 2000 INR

After completing this you will get a diploma.

The certificate course provided by ignou is certificate course in food and nutrition. Its duration is 6 months. The fee of this course is 1100 INR.

So if you want to do this for career making purpose diploma will be more useful.

As if you compare the two I think diploma course will be more beneficial as the diploma courses have more weightage than certificate courses.

Hope this helps.