I think this is a really harmful view towards people with eating disorders (of course, Ruby hasn't declared that she has an ED but I think it's safe to say she shows symptoms of disordered eating habits). People with EDs do not need to be underweight. Maybe her body metabolizes things differently, so she's not showing such rapid weight loss, maybe she binge eats, maybe we can't tell how much weight she's lost because of the type of clothing she wears.Without commenting on her body, I stand by my point that all her behaviours are for show. If she was consistently eating as little as she shows and exercising as much as she is, and this has been going on for as long as she’s been showing it for, she’d be severely underweight by now.
Her eating habits greatly worry me, as well as her seeming romanization of being cold. Back when I struggled with an ED I used to dress inappropriately on purpose, with the mindset that when I was out I couldn't put something on anyway, so I'd be burning extra calories. I worry this is what's happening here. With the tea drinking also, I would drink lots of tea to feel full and to drink something with a taste but with no calories. In her newest video in the beginning she also seems to chew for such a long time, because it's sped up you can't tell exactly obviously but it really seems excessive. Another thing that people with EDs do.
It's very concerning that this is what she's showing to her (mainly young) audience.