Wholegrains have 3 edible layers:
01 BRAN
Rich in fibre, B vitamins, minerals and phytochemicals (beneficial compounds produced in plants)
02 ENDOSPERM
Contains mainly carbs and proteins
03 GERM
Packed with B vitamins, Vitamin E, trace minerals and phytochemicals
Here's the whole truth: all grains start out as wholegrains. But to keep that name, these grains have to retain all three layers in their original proportions after milling.