> It seems to me senescent cells build up because we always have enough food Sorry, I don't see the "logic" on this. I see the logic on the article though, whi

> It seems to me senescent cells build up because we always have enough food Sorry, I don't see the "logic" on this. I see the logic on the article though, which boils down to this: our bodies' only goal is species' permanence, and every investment in maintenance or otherwise must contribute to that. If I were designing my own body, I would put any excess of energy into cellular maintenance. On the other hand, nature would want me to accumulate fat for when the winter comes and my hole next to the tree stump gets cold. Here is something that I keep thinking: you can't compare a living organism to, say, an airplane, because an airplane has fixed structural parts which are impossible to replace, and those parts accumulate tear and wear. A living organism on the other hand can gradually replace each of its parts (molecules, cells, organs), provided it has/runs the program to do so. So, senescence and mortality are not fundamental laws of physics, but simply ways in which evolution has accommodated things.