In addition to delivering an education, today’s teachers are increasingly expected to deliver high self-esteem to children in their care. It is assumed that those with high self-regard will, for example, perform better in school and be less likely to bully others. And so self- esteem is referred to as something that can be taught and learned, and it is believed that raising it can only be a good thing. But there are some reservations about our embrace of self-esteem.

Psychometric measures of narcissism and self-esteem in young people have risen since the 1980s. A national study of 16,475 college students in the US concluded that today’s young people are more narcissistic and self- centred than their predecessors. The researchers attribute this to the “self-esteem movement” of the 1980s and concluded that the effort to build self-confidence has gone too far.

Others agree. A meta-analysis of 72 studies on empathy over 30 years, involving almost 14,000 university students, offers little flattery: “College kids today are about 40 per cent lower in empathy than their counterparts of 20 or 30 years ago.”

Research into high self-esteem is now finding that there are good and bad forms. A study in the Journal of Personality found that “for those in which (self-esteem) is fragile and shallow, it’s no better than having low self-esteem”. It is now becoming clear that, of the multiple forms of high self-esteem, only some consistently relate to positive psychological functioning.

High self-esteem among pupils does not produce better grades. If anything, it may be the other way round: getting good grades leads to higher self- esteem. A study at Virginia Commonwealth University found that university students with mediocre grades who received frequent self-esteem boosts from lecturers ended up performing worse in their final exams than students who were told to try harder.

It has often been assumed that low self-esteem is more likely to be a cause of violence, yet violent people often think highly of themselves. People with high self-esteem are likely to respond aggressively when an inflated view of themselves is threatened by criticism or perceived insult, or if their need for gratification is interrupted.

Violent criminals, who we have been told are “acting out” their low self- esteem, actually have the highest scores on a personality scale of narcissism. And high self-esteem has been linked to bullying. The researcher Roy Baumeister says that, “according to most of the studies that have been done, it is simply untrue that beneath the surface of every obnoxious bully is an unhappy, self-hating child in need of sympathy and praise”.

The American Psychological Association commissioned Dr Baumeister and other experts to assess the benefits of high self-esteem. His conclusion was unequivocal. “My recommendation is this: forget about self-esteem and concentrate more on self-control and self-discipline. Recent work suggests this would be good for individuals and society, and might fill some of those promises that self-esteem once made but could not keep.”

Enhancing self-esteem has often focused on expressing feelings and emotions without, at the same time, demanding self-discipline and self- control. Other researchers now also believe that perseverance, resilience and reality-testing are much better predictors of life fulfilment and success than self-esteem.

Children who are repeatedly told that there is little about themselves that demands improvement are being helped to develop a distorted, socially unviable sense of self. On the other hand, parents and teachers who set realistically high expectations, criticise when it is warranted and are intolerant of egotistical behaviour and values are doing children - and the rest of us - a great favour.

Healthy self-esteem is not developed through contrived platitudes but through experience; it is a by-product of living in a constructive way. Instead of trying to raise it directly, it is better to focus elsewhere (such as on what a child does) and enable self-esteem to rise as a side- effect. Most importantly, self-esteem should not be outsourced to teachers; it is primarily the responsibility of parents.

The next time we hear self-esteem-boosting catchphrases such as “Because I’m worth it”, we should question why we hold self-esteem in such high esteem.

Dr Aric Sigman is a fellow of the Society of Biology and associate fellow of the British Psychological Society, and author of `The Spoilt Generation’ (Piatkus, 2009).