At present, "grass-fed beef" means exactly that: 100%
grass-fed. All producers selling grass-fed beef are
selling beef that was raised entirely on grass and
other forage; ZERO grain.

The USDA has proposed a change to its MARKETING (not
production) rules that would *allow*, but not mandate,
that beef marketed as "grass-fed" could come from
cattle who in fact were fed up to 20% of their calories
from grain. The rule has not been implemented. Derek
is lying.