I have another theory to explain the decline of almost everything in the human recently: Cause by the antibiotics and electric power.

In the era without antibiotics and electric power, parents have to use far much time than nowadays to take care of children, if the child has a little bit of health problem, temperature, bacteria, and viruses would kill the child, is the temperature, bacteria, and viruses remove the "individuals with little problems " from the human gene pool. They polish the human gene pool by killing ~50% of children in the era without antibiotics.

After human removed these factors, the quality of life and health in the human will be...

Reference: https://vdare.com/articles/of-mice-and-men-spiteful-mutations-look-bad-for-the-west

Off topic, the mod of raddle must be mad for how you "kick" people into saidit.LOL.