I constantly tell my clients to "let go" of those before and after shots flooding the internet. More often than not, they aren't real! Or they are altered or simply put into perspective like time of day, how recently you worked out, lighting, editing, etc.
This video, while on the comedic, sarcastic side... still does a great job of dispelling some of these photos. Check it out here: https://www.youtube.com/watch?v=M957dACQyfU