found this:
The apparent
weight loss effects of water are still a subject for further research, but there is some evidence that suggests that drinking
water can be associated with appetite reduction (for middle-aged and older people)
[1], consuming fewer calories
[2], burning slightly more calories
[3], and eating more
fruits and
vegetables[fn 1]. Increased water consumption, or replacement of energy-containing beverages with energy-free beverages,
[4] or consumption of water-rich foods such as fruits and vegetables with a lower energy density,
[5] may help in weight management. Popular advice to children regarding water consumption is often inaccurate.
[6] This evidence has been used by some of the scientists who worked on this research, and by others, to bolster suggestions that people who are trying to lose weight can benefit from augmenting – but not replacing – their dietary programs by drinking water, either before meals or at any time. Such advice had previously been given by
dieticians even before the most recent research was published.
In the case of appetite reduction, the apparent effect has been reproduced in a published study
[1] in adults aged 55–75, half of whom were instructed to drink 500ml of water before every meal, while following a low-calorie diet. This behavior led to the water-drinking cohort losing weight faster over a 12 week period. On average, the water-drinking cohort also continued to lose weight - although at a slower rate - over the following 12 month period, even though they had ceased their low-calorie diets. The study authors attribute this to the fact that those participants continued to drink water before meals.
A promising
[2] approach to reducing
appetite which does not involve taking any
drugs, and is very safe, is to drink a moderate amount of water before a meal.
[2] Though this had been a
folk remedy for
overeating for many years, and is recommended by some
dieticians[7] and stipulated in some scientific studies, it was only recently that the approach was subjected to a scientific
randomised controlled trial to see how much effect it had.
[8][9]
In a prior study[
citation needed], researchers had found that water drinkers ate 75 to 90 fewer calories per meal.
[7][9] However, they wanted to know whether this effect made a difference to weight loss, or whether it was canceled out by subjects eating more through the day, and so they did a randomized controlled trial to find this out.
[1][2]
Davy et al
[1] took a group of 48
overweight and
obese[1][2] Americans aged 55 to 75 who were considered
inactive, and divided them randomly into two equal-sized
[10] groups. The
control group simply followed a
calorie-controlled diet equating to approximately 1500 calories per day for the men and 1200 calories per day for the women. The second group followed exactly the same diet, but drank 500
millilitres of water before each meal.
[8] Both groups kept up the diet for 12 weeks. Although
both groups lost weight on average – as scientists would expect to happen, because such calorie-controlled diets are known to be effective – the water-drinking group lost about 5 pounds more on average, which made the diet 30% more effective.
[2] Because the water-drinking group reported feeling both more full and less hungry, the researchers believe that the water acts to suppress appetite.
[3][11] The researchers also recommended that people wishing to lose weight should replace sweetened calorie-containing drinks with water.
[7][9][12]
Subjective effects also reported by the water-drinking group were a clearer mind and a better ability to think. There were no negative effects reported.
[13]
j
ust info doesn't really confirm anything as such just that there are studies etc. cant find anything on the GMC website or anything published by an MD.
i find the whole water thing works for me too and would like to know how/why can it be proven etc (mostly cos I'm nosy 
)
but my skeptical side thinks that approx 95% of research and trials are paid for by drug companies etc an as water is free no one will fund a full proper study and may be we will never know
