my boyfriend has a sister and she is VERY fastidious about what she eats and she is very small and skinny. she wont eat meat, she will hardly eat dairy. she will only eat steamed vegetables that are plain. if they have butter, sauce, seasons, she will NOT eat it. when we go out to restaurants she will ask exactly how the vegetables are prepared if she cannot get it her way she will literally only order like one small thing. like say a sweet potato completely plain and will eat like 1/4 of it and mash the hell out of it and push it along side her plate to make it look like there is less food then there really is. she will eat at thai places but she is very particular about how she wants it made. and she goes and grabs decaf coffee ALL the time through out the day and my mom suggested that she probably gets it so she can feel full without having to eat. cause it is strange that she will get large decaf coffee multiple times a day almost everyday. i asked my boyfriend about it and he gets really defensive as if i am attacking her which i am not doing cause her behavior and tiny frame for a 25 year old is shocking. he insists that she does eat but i have been out with them to eat on a lot of occasions and i hardly ever really see her eat at all. and i noticed not only is she is addicted to coffee but she keeps dieters green tea on hand. she does not eat to enjoy- she admitted this herself she says she only eats ' intuitively' and will only eat food that she thinks will fuel her body. she does eat yogenfruizen it seems like it is the only semi fatten thing she eats. is this normal? am i just over worrying for nothing, or does she have an eating disorder. the stuff she does bothers me and my boyfriend and his family will hear nothing of it but i don't want anything bad to happen to her.

only eating vegetables and decaf coffee is not healthy she is five foot three and weighs about 85 lbs. and not only is she limiting her diet to just produce, coffee, oatmeal(when she does eat it) and the occasional very plain unsweetened frozen yogurt she is eating very little of it. and i am not the only one who has noticed this too so this is why i am asking. so no i dont think she is just putting '' healthy nutrients in her body.''