Chocolate vs Vegetables

When astronauts are blasted into orbit, NASA provides them with basic chocolate rations to sustain these plucky adventurers through the long, lunar months of zero-gravity solitude. Similarly, special forces would never, ever creep into enemy zones to conduct their black operations without a bar of dark chocolate to munch in the inhospitable desert. But the government orders the rest of us to devour as many vegetables as possible, the greener the better, if we desire to remain healthy. Why? They obviously don't seem to practice what they preach when it comes to feeding their own people, even in the most physically demanding environments and energy sapping situations. Neil Armstrong didn't drag a barrow load of FDA approved broccoli to the moon. He took his giant leap for mankind with only a few squares of 85% cacao Ghiradelli to create a crater-side picnic for himself, possibly a fancy assortment of gourmet truffles also, and maybe a selection of Oreo cookies to dunk in his vacuum-sealed milk substitute. At any rate, his space suit pockets weren't bulging with brussels sprouts and organic carrots that's for sure.