The latest health fad to become a craze in Hollywood is the coconut water diet, with followers including Madonna, Sienna Miller and Jessica Simpson. The good old coconut water is the favourite of a growing list of stars and Madonna has even invested $1.5 million into one of the the companies which markets the liquid.

Demi Moore, Matthew McConnaughy and Red Hot Chilli Peppers frontman Anthony Kiedis have also invested significant sums of money into the drink, reported Daily Mail online.

Since the news of Madonna’s investment broke, several US stars have been pictured with the product, including Courteney Cox, Chris Pine, Anna Paquin, Ed Westwick, Karolina Kurkova and Kristin Cavallari.

According to the company Viva Coco’s website, the liquid is obtained from green coconuts (as opposed to fully ripened brown ones), so the liquid is very similar to water, and not the cloudy, milky substance found in the matured fruits.

Because of this, the liquid contains virtually no fat, and can therefore be used as part of a balanced diet to aid weight loss.