We figured out the water, but it remains to find out if the lemon gives it any useful properties?

Its fame as a weight loss tool began back in 2008, when Japanese scientists proved that obese mice with reduced insulin sensitivity show a positive trend in losing weight if polyphenols isolated from lemon were added to their diet. The same study said that it is not yet clear whether lemon will have a similar effect on humans - more research will be needed to find out.