In relation to your comment about vegan diet on veganism (Q181138), plant-based diet (Q7201457) should not be used.
My concern is with MeSH descriptor ID (P486). https://meshb.nlm.nih.gov/record/ui?ui=D014676 is for vegetarian diet. https://meshb.nlm.nih.gov/record/ui?ui=D000067269 is for vegan diet "avoiding animal products in any form". This term was added to the MeSH system in 2016.
On the English Wikipedia, "vegan diet" redirects to "veganism", and "plant-based diet" states that "While a plant-based diet avoids or has limited animal products, it is not necessarily vegan." It may be that a separate item for vegan diet is needed here.