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This article first presents a few fictional stories that will allow us to clarify our ethical and political intuitions on the just and the unjust. On this basis, the author wishes to explain a certain number of presuppositions that underly our assertions relative to the injustice of certain health inequalities. It then comes down to showing how the notions of just and unjust are in certain ways insufficient to give us a hold on the sanitary realities we deplore, as well as to show that in fact we deplore them. Then we examine the public health problem of weight and obesity, which brings us to two notions that are probably necessary for our study: that of the good and the good life on one hand, and that of social pathology, on the other. But before arriving at any conclusions, the author passes by a reflection on tragedy.