There was even a proposal, put forward recently in the British Medical Journal, that happiness should be classified as a "mental disorder". Thankfully, it was a joke, intended to satirise the fact that what previous generations would have thought of as simple unhappiness can now be defined as one of a range new-fangled psychiatric conditions...
Having failed to come up with cures for what he describes as "serious" diseases such as cancer and dementia, Dr Le Fanu says the pharmaceutical industry switched its attention to what he calls "lifestyle" problems - unhappiness, obesity, baldness and forgetfulness.
But can the medical industry bear all the blame, or is this phenomenon a natural byproduct of a modern consumerist culture of instant gratification? Can we really expect a normal person from a culture of home-delivered fast food and channel surfing to develop a stoic resilience to life's ups and downs, rather than popping a pill to make everything alright?