more info (and quite alarming, but I guess you could always say the sample was too small!), this study looks at vegetarian teens:
This study aimed to identify attitudes, health behaviours, social adjustment and self-reported health of vegetarian and omnivore teenagers and determine characteristics independently related to vegetarian status. Participants were 630 Grade 9 students, ages 13-15 years, in seven schools in Ontario, Canada. (snip)
Dieting behaviours (current, frequent and past year), alcohol use, poorer social adjustment and poorer self-rated health were positively related to vegetarian eating (p<.05).
The independent, positive association of alcohol use with vegetarian eating is a unique and concerning finding. Dieting behaviours were strongly, independently and positively linked to female vegetarian eating.
Of course an explanation might be that girls with eating / drinking / social disorders are more likely to become veggies, rather than prove any influence of a vegetarian diet (or lack of protein) on their bahaviour.
I think I'd spend quite some time understanding why your girl wants to become a veggie...
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