i think you have to decide to go very low and let your body change to fat burning (i.e. try to put up with the feeling rotten for a while) or go medium/low and benefit from the reduced carbs but bouncing in and out of very low you may find your body doesnt know if its coming or going (i.e. should it burn carbs or fat), so you won't push through into the ketosis and start to feel better, i could be wrong I'm no expert, have you considered a salad at lunchtime? maybe with some cheese or cold meat, is the lo cal jelly sugar free? the water biscuits (ughh) be great to find an alternative, low fat crisps are pretty much the worse thing to eat, if you are going low carb enough to get into the fat burning then the body will need some fat to burn, so anything that says low fat isn't any good and won't fill you up so your be inclined to snack more often and they are made from potato so.... i hope some of this makes sense, I'm not trying to tell you what to eat just trying to help