Life forms adapt, and thereby strengthen, by countering detrimental influences. Given that man is increasingly less dependent on his (natural) body defence mechanisms, and more reliant on (unnatural) man-made solutions (pharmaceuticals), is it the logical conclusion that the biological defences are weakened? It may be argued that by eradicating a particular disease its defence would not be needed, however, once that defence is gone it may not be revived. Dependence on non-evolutionary factors undermines the ability to adapt in an evolutionary context. But perhaps the alternative is thousands of deaths for the sake of evolution.