*The following is excerpted from an online article posted on ScienceDaily.
Significantly higher numbers of Generation Z boys and girls in the UK are dieting to lose weight, and are likely to overestimate their own weight, finds a new study.
The research, published in JAMA Pediatrics, found that girls who are trying to lose weight are also more likely to experience depressive symptoms than in previous years.
In 2015, 42% of 14-year-old girls and boys said they currently were trying to lose weight, compared to 30% in 2005.
Lead author Dr. Francesca Solmi (UCL Psychiatry) said: “Our findings show how the way we talk about weight, health, and appearance can have profound impacts on young people’s mental health, and efforts to tackle rising obesity rates may have unintended consequences.
“An increase in dieting among young people is concerning because experimental studies have found that dieting is generally ineffective in the long term at reducing body weight in adolescents, but can instead have greater impacts on mental health. We know, for instance, that dieting is a strong risk factor in the development of eating disorders.”
The research team reviewed data from 22,503 adolescents in the UK, in three different decades, who are part of different cohort studies: the British Cohort Study (of people born in 1970; data was collected in 1986), the Children of the 90s study (born 1991-92, data collected in 2005), and Millennium Cohort Study (born 2000-02, data collected in 2015).
The adolescents were all asked questions about whether they were, or had been, trying to lose weight, whether they had dieted or exercised to lose weight, whether they perceived themselves to be underweight, about the right weight or overweight (which was compared to their actual height and weight measurements), and they filled out questionnaires that gauged depressive symptoms. The researchers found that in 2015, 44% and 60% of all participants had dieted or exercised to lose weight, respectively, compared to 38% and 7% in 1986.
While girls have consistently been more likely to diet to lose weight, the researchers found a greater increase over the years among boys, who were also becoming more likely to be trying to gain weight.
Both girls and boys also became more likely to overestimate their weight from 1986 to 2005, and even more so by 2015, which the researchers say adds to their concerns that increased efforts to lose weight are not necessarily due to increased obesity rates.
The reported weight-related behaviors and weight misperception were associated with depressive symptoms, and among girls, this relationship was becoming even stronger over the three decades examined in this study. The findings could possibly be part of the explanation for increases in adolescent depressive symptoms that have been observed in recent decades.