Glad you're a bit skepitcal....sounds a bit odd to me.

From the other end of the scale, I only ever put on 8-10kg during preg but I have a degree of kidney failure and drink at least 3L of water per day to keep my kidneys flushed out then there's all the milk I drink for heartburn plus the occasional cup of tea/softdrink and all the regular food.

That's a very odd theory....