Similarly, many things have issues that may not seem like issues at first. For instance most people are deficient in protein owing to simply not getting enough and a significant chunk of what they do get coming from sources with extremely low digestibility/DIAAS scores.

And somebody may not even realize this until they decide to start downing a few more chicken breasts per day and suddenly see their energy levels skyrocket, their hunger diminish, and so on. But if you surveyed them prior, they'd claim to feel perfectly normal.

Another one is testosterone which is extremely unfortunate because there's no remotely natural way to meaningfully regain significant amounts of it, but TRT is a life changing thing for many people who have low testosterone which in modern times is a huge chunk of all men and essentially all of them over a certain age.