I always eat some lean ham or some hardboiled egg whites. If it's the texture and crunch you miss, pork rinds, rye crackers (very low in carbs and some have actual flavor) or celery w/peanut butter or cream cheese.
If you are in Ketosis, then you cannot use "low-carb-bars" as a supplementation to curb cravings. Why, you ask? It's because "low-carb-bars" contain glycerol, which doesn't raise your blood sugar like a normal carbohydrate would, but (there is always a but) it get's stored in the liver as glucose (when liver is full then proper Ketosis cannot occur). Many studies have shown us that glycerol is a big No-No while in Ketosis.
P.S. Metabolic Diet = Anabolic diet but, with a "clean" carb-up...come on now, who is he trying to fool