Maggie, I wouldn't interfere with the process when you are just getting into ketosis, but once you are firmly in it, then I would check the ingredients list; if it has no carbs or very low carb count, it is nice to sometimes change things a bit...of course also check the fat and protein content and all that...also salt - they may have too much...sure they'll have a whole slew of preservatives and chemicals, but...sometimes you just want it.