portion size

Do you enjoy nibbling on a muffin from a well-stocked pastry case while you sip your morning coffee? The next time you do, take a close look at this common baked good. Today's nibbles look like yesterday's mouthfuls. Muffins sold in corner coffee shops, grocery stores, and vending machines are larger than those sold in the past, and are more than three times the size of one standard portion.