The ones that are "meal replacement bars" are the ones that you want to go with. Try to find ones that are natural; usually the low carb bars put tons of splenda or aspertame in it to sweeten it up. I recommend a peanut nature bar; dont worry about the amount of fat if it is natural just make sure the saturated fat is below 6. Trans fats are definately a NO; pass up a bar even if it has 1 gram trans fat.