Juice is the key to a jolly good Christmas . . .

And all you need is a passport, 200 euros and a taste for fruit juice.

That’s the promise of the Obsidian Retreat in Spain, which is offering 3-day/two night detoxes at its base in the hills above Alicante.

The retreat specialises in the juice diet, currently helping to keep the likes of Simon Cowell, Katy Perry and Russell Brand in trim, but it also offers therapies such as massage, reiki and hydrotherapy, as well as facials, manicures and pedicures and a range of other activities.

Owner Andy West reckons you can pick up a one-way flight for as little as £21 this month, so all you really need is somebody to do the shopping and wrap the presents while you’re gone.

"We all want to look and feel our best at

Christmas. We guarantee you'll come back from the Obsidian Retreat refreshed, full of energy and feeling confident for the festive season," says Andy.

The price includes as much healthy nutritious juice as you like, exercise and lifestyle programmes and one colon hydrotherapy treatment. Bet you can’t wait . . .

Of course, if all that is too much to fit into your pre-Christmas schedule, you can still get the benefit of the Obsidian way in the comfort of your own home.

Sign up online for the 3-day detox plan and you could, they promise, lose up to 7lb by following a special juicing plan developed by trained juice therapist Carol West.

For more, visit www.obsidianretreat.com or search for obsidianretreat on Facebook.