Is it just because you need to eat fat to stay full and if you're eating low-fat then you won't be getting the fat that you need? (I'm not talking about processed rubbish with sweeteners, additives etc, I mean something plain like Total fat-free yoghurt...)
But if you take some of the fat out, surely that only affects the fat? I just looked at the nutrition for the Total Greek yoghurts and the fat-free one is actually lower in carbs than the full-fat one... but I'm sure somewhere I read on here says that you aren't allowed those on botocamp...
I think olive oil is ok if used at lower temperatures such as for salad dressing and veg roasting etc. Butter is more stable for frying and doesn't change chemically into transfat, which olive oil does.
I do hope BIWI comes along soon and explains it all with links.
all I know is I did bootcamp at new year, lost every pound I wanted to and have maintained ever since.