Everything in moderation is the key here I think. You can overdo anything, no matter how harmless, if you abuse it. It is like exercise or water: They are both really good for you, but too much can hurt you if you go overboard. (Not meant to be a drowning pun... lol)
WF and DaVinci are great to help you stick to the diet and not feel deprived, but I don't think I would use them more than what is strictly necessary.
Listen to your body. I think some people could probably down a whole bottle and not be affected at all, while others may be more sensitive to it. Try and use them just as much as you need to be content, and see if it affects your loss. Then adjust accordingly.
