S1, E4: Two weeks into the experiment in living by a Palaeolithic diet the remaining Brits are starting to get to grips with the demands of the hunter gatherer lifestyle. The women have outlasted and outshone the men in their adaptation to the rigours of bush life, and their success in trapping now regularly puts game birds Guinea Fowl and Franklyn on the menu. But the already diminished team is dealt another blow with the emergency evacuation of 24 year old Melissa, airlifted out of Namibia with a suspected deep vein thrombosis. It is left to the remaining four to finesse the essential bush art of eating whenever and whatever is on offer - even when that's Africa's largest rodent, Porcupine. King Rat is prized not just for its meat but its decorative quills, and the dangerous and bloody underground battle required to secure it makes 21 year old Beth and 22 year old Louise at last willing to confront the brutal reality of where food comes from. In the meantime it's up to Mike, the 25 year old housing officer from Cardiff, to uphold British honour on the big game hunt. But before he can hunt his arrows must be tipped with poison harvested from the larva of the African Leaf Battle. Just three of the deadly grubs are enough to kill a giraffe, and Mike is understandably nervous. As the experiment draws to a close nutritionist Alice Sykes can reveal the now not-so-big Brits' progress in weight loss and reduction in BMI, but for most the biggest revelation by far is the huge increase in confidence the experience has given them. They bid farewell to the Ju'/Hoansi bushmen who have been their hosts and teachers and return to the UK, determined to put their previously morbidly dysfunctional relationship with food behind them for ever.