One other point of view is we might be getting sicker because we’re living longer, and because modern medicine keeps us alive longer when we would have been dead of a simple virus or flue centuries ago. Many women died in childbirth back then, people succumbed to typhoid, diptheria and all kinds of things when they were very young. Today those same people who would have died are kept alive from antibiotics, vaccines, etc. until an age when they succumb to cancer or something else.