I don't really have a source, but it's common with protein powders.
They'll list 28 grams as a serving size with a scoop that has a line in it about 3/4 of the way up that represents 28 grams. Technically not misleading, but it's absolutely reasonable that people would assume 1 scoop = 1 serving size. The end result is that people go through more product.
If you watch professional bodybuilders who have to be very exacting about their intake, you'll see them tell you to always measure on the scale because you can't trust the scoop.
They'll list 28 grams as a serving size with a scoop that has a line in it about 3/4 of the way up that represents 28 grams. Technically not misleading, but it's absolutely reasonable that people would assume 1 scoop = 1 serving size. The end result is that people go through more product.
If you watch professional bodybuilders who have to be very exacting about their intake, you'll see them tell you to always measure on the scale because you can't trust the scoop.