Also, I eat pretty healthily to begin with. Cook from scratch almost every day, plenty of fresh veg, fruit, (gluten and lactose and egg free due to digestive issues), and I was already compressing my meals into an intermittent fasting pattern of 16 hours fasting and 8 hrs eating, meaning I was eating at lunchtime then earlyish dinner. I was eating smaller portions than the sirtfood diet provides. So really, I have included the juices, dropped a meal for 3 days, swapped red onions for white onions, kale and rocket for other green veg, eaten more seafood and less quorn, eaten more capers and dates and walnuts, and swapped buckwheat for rice. We use lots of garlic and ginger and tumeric, and I swapped to bird eye chilli from regular red chillis. I've switched green tea for decaf black tea with almond milk. So really, it's hard to see how that could result in losing 2.5kg in 4 days unless the sirt foods do something different, as the changes haven't been that drastic.