Pippa Middleton’s restrictive and risky pre-wedding diet

What does a British socialite and sister to the Duchess of Cambridge eat to drop pounds just days before her wedding? In less than one month, Pippa Middleton will marry James Matthews, chief executive of Eden Rock Capital Management Group, which has offices in London. The world has been watching Pippa since 2011 when she walked into Westminster Abbey lifting the train of Kate Middleton’s royal wedding dress. While it was her backside that had us wondering what she ate then, with impending nuptials of her own, we wonder what she may be doing now to get in even better shape — if that’s possible. Elle reported that Pippa was photographed leaving a fancy fitness center in London, on Wednesday after taking a 75-minute pilates class. Elle also gave details of Pippa’s pre-wedding diet — something most of us have never heard of — The Sirtfood Diet. The strict diet includes 20 specific foods,…