On any ordinary day, you'd know that cheese is a high-fat, high-cal choice—but when those simple little cubes are sitting there amid all the holiday treats, they start to look like a good choice. Beware: If you grab five of those little 1-inch cubes, you've just housed 345 calories. Add a small handful of crackers to that and you're easily at 500 calories.
Better bet: If you truly want cheese and crackers, limit yourself to a few—say five crackers (about 80 calories) and top each with a very thin layer of a cheese spread (think: goat cheese or even cheese ball).