FIZZY MINERAL WATER

What it does: Relieves constipation How it works: Researchers at Federico II University in Naples found 80% of people with constipation were cured after drinking fizzy water for two weeks. Its down to a combination of the added minerals in the water and bubbles stimulating the nerves connected to the digestive system, they say.

And upping your intake of H2O can also reduce fluid retention and bloating, according to Dr Wendy Doyle of the British Dietetic Association. “The most important thing to combat dehydration, bloating and constipation is to drink plenty of water, and some people find fizzy water more palatable, which is fine,” she says.