I think it's just her natural build. My son is the same tall and rake thin with prominent veins yet he can eat anything and everything and often does and never gains any weight whatsoever.
In fact he worries himself about looking underweight and malnourished (is a bit self conscious) and would like to bulk up but can't.
Despite eating very well and exercising?
I think Angelina is the same except I think she is also highly strung and a bit nervous so I think it's difficult for her to gain weight?
I don't think she starves herself but maybe neglects her self care or gets too distracted to eat.
Maybe she doesn't have a very big appetite?
Whatever the reason I don't think she has an eating disorder or is particularly bothered by food?
Some people are just like that?
Just my personal opinion of course and I understand why people would think she is ill because Hollywood is a dysfunctional place but I think she's making a concerted effort to be as normal as possible?
Also I think she wants to be a good role model for her daughter's so I can't imagine her having a eating disorder because of the potential impact on them?
I remember during lockdown there were lots of stories in the DM of her out shopping at whole foods (seems like a regular thing) so I think she is careful about what she eats but not really unhealthy?
Maybe I'm being naive I don't know but my feeling is that she is (relatively) down to earth or as normal as it's possible to be considering her upbringing?