Much butter now, thanks!

Her doctor advised her to stay off dairy. She stayed off cheese and milk but as she loves butter she expeditiously declared butter a ‘non-dairy’ product:

Her ‘bright new world’ discounts science
as too stodgy a reliance

With single-mindedness utter
she declares it non-dairy
and goes on indulging butter
Handy to let facts vary!

Thanks, Non-Dairy Cow
all much butter now!