The Fast Diet (The official diet) : Mimi Spencer :Alejandra "Alex" Ruani 5 Comments. For over 20 years, he's been studying the complex mechanisms which control aging. For example, did you know that his lab mice hold the world record for longevity extension in a mammal? And when it comes to humans, he challenges other experts to show him an even better way to trigger the most extreme metabolic changes that he currently evidences with a 4-day fast. Alex Ruani: So what exactly are the key metabolic changes and biological benefits of a 4-day fast?
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How fast can you get it off? Try fasting the way image: wikipedia. But In Europe and the UK, where it's been the diet fad of the year, you don't even need to name it. Announce, "It's a fast day for me," and your dining companions pull away the bread basket and nod sagely. Then everyone chimes in to share their fasting tribulations.