Compared to mature oat grain, why is young oat grass valued in human nutrition?

Answer

High concentration of vitamins and minerals relative to volume

While mature oat grain is rich in carbohydrates and fiber, the young grass is specifically valued for its high concentration of vitamins and minerals relative to its physical volume.

Compared to mature oat grain, why is young oat grass valued in human nutrition?
foodplanthumanconsumptionoat grass