The fundamental reason of evolution is the mutation of genes in human body. The individual quality produced by mutation is a matter of probability, and there is no healthy evolution as you say. For example, does giraffe mutation produce individual health with short neck? The so-called evolution means that all kinds of individuals are produced by mutation, and then natural selection is carried out in the natural environment to produce individuals more suitable for the environment. Unsuitable ones will be eliminated, that is, individuals will die, so that unfavorable mutant genes will not be inherited, and favorable mutant genes will be inherited.
These are the basic principles of evolution. All individuals in human society can be preserved, that is, genes that are beneficial or unfavorable to adapt to nature will be passed on to future generations. Because evolution is influenced by natural selection and gene mutation, without natural selection, evolution will stagnate or produce various disasters. This is one of the reasons why there are many more diseases now than before. In ancient times, some people had a strong immune system to resist diseases, and some people died when their immune system was weak. Therefore, people with strong immune system can pass on their related genes, so that the immunity of future generations will be stronger, so there will be fewer diseases. Modern people can survive regardless of immune strength, so diseases are rampant now.
Er … you're a good question. I'm sorry I can't help it … It's estimated that ecologists will have a headache when they see this question … Because there are too many probabilities involved in this question, who knows which mutation will occur in the DNA sequence of so many Taoist priests? How to ensure that the mutation must be a gene? At present, the human gene bank has not been established, and the exact number of human genes has yet to be studied, so it is impossible to calculate this probability. That's all I can tell you. I'm sorry