1124holiday-calories A deck of cards, two computer mice, some salad and two slivers of pie, please. If you're hoping to keep this Thanksgiving from turning into another gut-busting affair, that's what your plate should look like: a serving of turkey no larger than a deck of playing cards and half a cup each of two starches. (A half-cup is about the size of a computer mouse.) And that's being generous. But Americans generally are clueless when it comes to proper portions, and on Thursday most will belly up instead to platters piled high with more calories and fat than an...