Hello,
Although you have a set of guidelines, you are in control of your diet. You are an adult, the choice of whether to stick to it as directed (or not) is, and always will be entirely yours. No-one here can give you permission, or forbid you from doing whatever you like. You are in charge of your weight loss project, the diet product is simply a tool.
However all decisions and actions have consequences. (If paid more attention to that maxim in the past, perhaps I wouldn’t be here now . Anyhoo…). If you or anyone else chooses to tweak a diet, you must accept the risk of it not working quite as well for you as it otherwise might. Again, your call. I would also suggest you read up on Low Carb diets (especially VLCDs), ketosis and how everything works before you consider going a bit ‘off-plan’. Treat Exante like a hobby, and do a bit of research. VLCDs are (IIRC) the singular most clinically researched diet out there, and there’s plenty of material on the net.
And given that you are in the early stages you might also want to consider that you have spent a lot of money on this product and you haven’t yet given it a proper chance to see what it can do for you. I might suggest getting into the swing of it, developing a habit, and getting a bit of weight off (for each decent week helps you face the next week). Then, if you want to consider a bit of experimentation, you will then already know what your ‘baseline’ is.
Finally, this diet is not easy for a lot of reasons and the first week or two will involve a lot of craving and gritting of teeth, but it gets easier. But that’s the trade-off for the results.
Hang in there, and good luck.