Every year, Americans throw away about $400 million worth of uneaten sweets from trick-or-treating. That’s a lot of food waste. But the fix is simple: stop giving away candies that kids don’t like (candy corn, anyone?) and give away treats that they do enjoy.To help you buy the sweets that trick-or-treaters will actually eat, candystore.com has published a study on the most popular candy by state.