Ah so it's probably just them being on the safe side? I know people who drink more than 3.5 a had, my boyfriend drinks 4 a day at least usually without really trying. Wondered if it was specifically because of the diet that they said that, guess in the days of health and safety they have to cover their backs.
I've seen lots of people say that about water actually, if they drink plenty, they have better losses. Definitely a reason for me to try and drink more, it's not easy though! Had a sneak peek on the scales this morning (I know, naughty!) and have to say, I'm very happy with things so far! Think I might pack them away now though, want to try not to weigh myself again until my trip to Amsterdam when I'll come off plan for a few days in about 5 weeks.