What really happens when you eat nothing but fast food?

When filmmaker Morgan Spurlock ate junk food every day for a month for his 2004 documentary Super Size Me, the results were shocking.

But despite the litany of problems, among them weight gain, sexual dysfunction and mood swings, reported by Spurlock, the world's appetite for cheap convenience foods is undiminished.

And although fast food outlets have added 'healthy' options to their menus, eating there every day still means loading up on calories, sugar and fat.

So what happens when you live on junk for a week? As one FEMAIL writer, Phoebe Jackson-Edwards, 24, discovered, just seven days is enough to make skin greasy and double the fat on your thighs.

Here she shares her experience... Full story...

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