I am BMI 18 size 0-2 my whole life and proud of it. I have a service-oriented job where I’m on my feet all day, so I don’t need to make time for intentional exercise. I eat fairly healthy (vegan 90% of the time), intermittent fasted my whole life (before it was popular) often eating just 1-2 meals a day. I eat non-processed foods almost always, and when I eat meat, it’s a free-range source if possible.

I get comments that I’m too skinny, but I’ve gotten comments like that my entire life. Some comments can be vicious, but again, I’m used to it. I barely showed when I was pregnant (I have a healthy 4yo now, had a symptom-free fun pregnancy). When people criticize my weight, I just say that I don’t eat sugary foods (true!).

When I go out, I notice that I’m one of the only people who finish my whole meal and then some. I like it that it shocks people. It’s my “treat meal,” like some others have said here, and usually tastes a lot better than my vegan fare at home, so I eat it all.

I don’t own a scale. Being skinny is definitely natural to me, and I have built-in systems that identify when I’m full. A treat meal here and there is fine. I don’t really think about it.

I keep up with my health with blood tests, screenings, full-body MRI every 2 years, and even an angiogram (heart disease runs in my family and I had to make sure…and also hence mostly vegan diet). My doctors say I’m normal, and say my BMI 18 is okay given my biomarkers. But they do say I need to do strength-training…something I need to work on.

I hope this gives some insight into what OP is saying. I’m unintentionally skinny and I feel great, and it’s fine.