New study says you don't need to drink so much water

If one of your New Year's resolutions was to drink more water, you can potentially scrub it off your list.

The most rigorous study to date on water consumption has revealed the often-recommended eight glasses a day is excessive for most people.

Water - it's everywhere and no matter how much we drink we can't keep it.

"Humans are leaky bags of water on legs, we lose water all the time," said registered nutritionist Nikki Hart.

Eight glasses per day has long been the accepted wisdom in health guidance worldwide and sometimes we really feel like it. But other times we don't.

"I don't drink any water, I drink coffee mainly," one person told Newshub.

"Water's disgusting, it has no flavour, I'd rather drink Powerade honestly," another added.

Sometimes it's hard to get to. But when it comes to consumption, some do the heavy lifting.

"Two to three litres each day," a third person said.

However a new international study out of Japan says most people only require about 1.5 to 1.8 litres of water a day. It's also found one size doesn't fit all - some people require less than others.

"I don't think you should do it by a number," Hart said.

This Kiwi nutritionist with a Masters in hydration is on the side of this new research and says there can be an obsession about drinking lots of water.

"I think of it as water bombing sometimes and I worry about that a little bit," Hart said.

The study also found we can get lots of our daily water needs through the foods we eat.

"Not so much dry food, like crackers and things but fruits and vegetables, and also tea and coffee," Hart said.

We lose water every day through perspiration, respiration and pee.

"People should actually just look down and look at the colour of their urine. Everybody says, 'I don't look down' - everybody looks down. Basically what we want is your urine to become less concentrated and more straw-like, more voluminous as the day goes on," Hart said.

But no amount of dehydration will drive some to the drink.

"Water is terrible, absolutely terrible," a member of the public said.