A degree in something or other

Having been vegan
4 decades or more
I’m long in the tooth
and equally sure
of my own nutrition
so if I should be
found wandering somewhere
at a quarter to 3
and I’m taken to some where
who wants me to eat
a burger of bobby cow
as my big treat
I normally say
I am vegan and they
get back in their police car
and just drive away

a degree in nutrition
must be the response
if you have only been vegan
a year say your bonce
not really filled up with the goods
so to say
then the professors of nothing
might say
they know everything that there is for to know
about you losing weight
and how your ears will grow
either related to rabbits
or some
believe you are a vulcan
just because they are dumb