Eating all your vegetables was a lot better for you in the '50s.

http://motherjones.com/transition/inter.php?dest=http://motherjones.com/environment/2009/09/looks-great-less-nutritious

Store-bought veggies weren't as pretty back then, but according to USDA data, they were packed with a lot more nutrients than their modern counterparts. The likely reason for the nutritional drop is that hybrid crops are often bred for size and color, not nutrients. Below, the stats for a few crops that have gone to seed.