Difference in cup size measurements for various foods
I was looking up the nutritional info of different whole grains, and I find that amount selected per cup serving of different grain types is not the same. For e.g.
Quinoa - 1 cup is 185 gram
Brown rice (medium grain) - 1 cup is 195 gram
Basmati rice (medium grain) - 1 cup is 196 gram
All the above are based on USDA data.
Any idea why these differences exist?