Not sure what you mean by “system,” so I’m just going to answer a thing I wish someone explained to me much earlier.
Not everyone feels hunger cues, so “just eat when you’re hungry” is bad advice.
I learned about anorexia nervosa as an eating disorder in middle and high school. People worried about me because I was thin and didn’t eat a lot, but I didn’t try to stay skinny and I ate when I was hungry, so I knew I didn’t have that. Ironically, learning about EDs made me sure I didn’t have a problem.
In college I took a class that defined anorexia as “a lack of appetite,” identifying it could be a drug side effect, from stress, or just how someone’s body is. It differentiated “anorexia” from “anorexia nervosa.” That opened my eyes that I did have disordered eating, but it was from physiology, not psychology.
I trained myself how to eat enough, but I still have to be careful not to fall back into old habits since I don’t have normal hunger cues. It’s constant work that might have been easier if I started building these habits from a younger age.
I appreciate your openness to thinking about this differently!
As an adult, my BMI has been as low as 16.1. Stress suppresses my already-weak appetite so it’s often a factor when I’m severely underweight. People saw me meeting society’s beauty standards, but not that I was extremely unhealthy physically and mentally.
It’s been over a decade since my low and I still float around the edge of underweight BMI, but I’m much healthier now (lots of credit to my partner for keeping me eating regularly!).
I think my struggles on this side have given me a ton of empathy for people who overeat or struggle with their weight. A lot of people dismiss weight as a simple matter of willpower and can be so unkind and judgmental.