High school boys fret about being too thin and high school girls worry about being too fat, according to that examined the mental health of Canada's adolescents, as well as their physical activity, cannabis use and experiences with bullying.

More than 26,000 students aged 11 to 15 attending 436 different schools participated in the survey, which involved Health Canada and the World Health Organization as well as research teams from 43 countries.

Some key findings:

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In one positive development, more young people felt their parents got them than in years past, suggesting the teenager-parent relationship may be improving.

"The early years are a critical period during which a person's health and well-being can be strongly influenced," said Canada's chief public health officer David Butler-Jones.

"Investing in research that focuses on key health priorities and lets us hear directly from young people contributes to better informed policies, programs and practice to help young Canadians transition successfully to adulthood."

Parents, do you feel you understand your teenagers and have the resources to buoy their fragile self-esteem?