Milk Here’s a reason to cry over spilled—or rather, expired—milk: All those half-full cartons of milk poured down the drain make an unhappy impact on the planet’s health, finds a new study from the University of Edinburgh in the UK. Researchers found that 700,000,000 pounds of milk are wasted each year in Britain alone, creating greenhouse gas emissions equal to 20,000 gas-guzzling cars on the road.  8 Ways To Afford Organics   Brown Rice You might think that there’s no harm in stocking up on huge bags of rice—it’s not like it’s perishable, right? Not exactly. While white rice can be kept in your pantry for up to five years without a problem, its healthier brown cousin starts to go bad in six months. The bran layer—the outer layer that gives brown rice its tan color—has some oil in it, which makes for a shorter shelf life.    Orange Juice Sure, the biggest jug of OJ in the grocery store might seem like a good deal, but by the time you use it, you’re probably not getting what you bargained for. Studies show that the vitamin C content in your juice can rapidly dwindle within days, which means you’ll have to chug a whole lotta juice to reap the nutritional benefits in time. 14 Diet Foods That Make You Fat   Ketchup Who wouldn’t be swayed by a giant tub of her favorite condiment—no more being caught without a topping!—but it’s wise to hold off. Condiments tend to only be good for about six months to a year after opening, and no matter how much you love burgers, it takes a lot longer to go through 114 ounces of ketchup than you’d think.    Also see: Bulk Buying, Slender Living, 8 Ways The Grocery Store Is Making You Fat,  Eco-Friendly Products For Your Home