In what way? I've work with nutrition and eating issues....and the 'natural' thin with a BMI lower than 20 are under 8% of the population. For the remainder to acheive that goal, they have to literally starve.
This would be me. I weigh somewhere in the range of 110 (maybe a couple pounds more) and am 5'4, which puts my BMI under 19, I think. I wear a size 4, sometimes a 6, depending on the cut of the clothes. It's my high metabolism, which I inherited from my dad's side of the family. I have had plenty of people tell me I look like I don't eat, but obviously they've never been around me at mealtime :) Plus, chasing 3 kids is good exercise!
Maybe you have factual data to support your comment on those two women in the pictures?