I keep track of not only calories, but the %ages of my calories that come from carbs, fat, and protein. I do best on a lower-carb, higher-protein diet so I shoot for 45% carbs, 25% fat, 30% protein. I've set up my custom nutritional goals to reflect this so at the end of the day, if I can still have more calories, I see if I need more carbs, protein or whatever and choose my snack based on that.
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