I really have always been perplexed by nutrition bars. For some reason and since I can remember, I've never felt that a nutrition bar is a meal replacement by any means. It's an even trickier task to choose the right kind of bar to eat while at the same time ensuring that its even good for you. Do you care about that? I suppose there are so many different reasons for eating one -- perhaps you don't have time for a sit down meal or its an "after workout" snack or you just don't want to cook and it fills the void. With the busy days ahead, you can at least try to look out for some nutritional value in the bar you are about to eat, especially if you really don't have all the time in the world...
I found this very helpful article from Tufts Nutrition Magazine
regarding nutrition bars and the following is a good list to go by when it comes to choosing your nutrition bar.
A short list of whole-food ingredients
that are recognizable
More oats, whole grains, nuts and dried fruit
Less sugar and syrups
No partially hydrogenated oils
Total calories: about 120 to 250
Protein: 5 to 10 grams
Fiber: at least 3 grams
Sodium: less than 250 milligrams
Fat: less than 2 grams saturated fat,
and 0 grams trans fat
Sugar: less than 10 grams