At every party you attend this year, there will be cheese. And around every cheese plate, there will be guests who don't realize how much of it they're eating. Tracy Gensler, a Best Life nutritionist, says this is one of the most common party mistakes she sees. An 80-calorie portion of cubes, slices or a spread is only about the size of two AA batteries, she says, and most people eat three to five times that amount (in case you're wondering, the calcium benefits are outweighed by the high fat content). The truth is, Gensler says, a once-a-year splurge probably isn't going to cause too much damage. But given the number of parties you'll attend this year at the homes of fromagophile hosts, it's best to be Cheddar-aware.