BREAKFAST BARS: You can't beat them for convenience, but choose carefully—many bars have only a gram or two of fiber, and most are loaded with added sugars, such as high-fructose corn syrup. Read the labels and look only for those that have no added sugars and at least 6 grams of fiber. Atkins® bars are a great source of fiber and are available in an array of flavors, so your taste buds can be pleasantly surprised every day of the week.
Most low-carb diet authors don't recommend bothering with it. Even many of those who think a ketogenic diet is a good thing just assume that a very-low-carbohydrate diet (under about 50 net grams of carbohydrate) is ketogenic. On the other hand, many people have found that monitoring their ketones, at least for a while, provides valuable information.