An indigestible meal.
Horses cannot vomit to get rid of toxins, or indigestible food.
That's because grain seeds are imbued with a survival self-defense so it can survive being eaten by a bird, animal or even a human by being indigestible.
Bee pollen in its pure form consists of mainly indigestible, chewy husks - so the pollen must be processed into a supplement form.
This is especially unfortunate because a major crop in Africa, grain sorghum, has a somewhat indigestible protein which our bodies have a hard time metabolizing.
Juicing removes indigestible parts of the beets but preserves their natural sugars and fresh, clean taste.