The main injuries I see while transitioning to barefoot are calve strains, achilles tendonitis, Anterior tibialis tendon injuries and the worst, broken metatarsals in the feet. You are definately training your muscles, tendons and bones to work differently with stresses they are not used to. We are biomechanically designed by nature to be barefoot so by using different movement patterns from what our bodies were designed for, we are not as efficient as we should be.
I think you have missed the point, it is not the reason to run barefoot, it is a result of running barefoot. Barefoot running is biomechanically very efficient as modern shoes have cushioning that allows us to heel strike resulting in inefficiency (putting on the brakes each stride) and makes us more prone to injury due to the impact forces caused by landing with our feet out in front of us with often straight legs. By hitting the ground with straight legs we cannot absorb the impact properly with our natural suspension system. By running barefoot or with minimalist shoes we dont heel strike because it hurts, so the feet land underneath us using our bodies natural suspension system of our knees and ankles.
Look it up. Your bones are constantly changeing by the process of osteoblasts and osteoclasts.. Your bones can get stronger, or weaker, depending on the load you put on them. Its the reason astronauts have problems with their bones when they get back to earth from a zero g environment. This discussion is about barefoot running, not bone density so please stick to the subject. Im happy to answer questions on barefoot or minimalist shoe running if you have them.
Actually your bones deossify and become less dense as there is less stress on them when in shoes. As soon as you start running on them barefoot, they will ossify more and become stronger and denser, the same way martial artists bones become denser when exposed to repeated impact. The article wasnt supposed to be an ad, I want to dispel some of the myths of bare foot running.