Britain's NHS reports that more than 200,000 people need medical treatment every year due to flip-flops; they cause long-term problems including shin splints, weakened tendons and aching toes. The takeaway: we just can't win.
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I'm throwing the BS flag on this. Human beings weren't meant to wear any shoes at all. If people have problems from flip-flops it's because their feet are uselessly weak and out of shape from being coddled to death in overpadded shoes during the months it's too cold to wear flip flops.
You are never supposed to walk by banging your heel down on the ground and you ARE meant to roll through every step.