You should be cautious when buying protein nutrition bars, not all brands are created equal. Different bars are made to meet different needs, you should be equipped with the knowledge of what is healthy for your nutrition needs. Check the nutritional info carefully; look for the amounts of sodium, fat, protein, and sugar in the bar. Avoid those containing partially hydrogenated oils or lots of sugar. Diet and Nutrition blog gives more useful information about what to look for in a protein bar.