Summary

Recent research challenges the long-held belief that depression is caused by low serotonin levels, suggesting a more complex understanding of the condition and its treatment, which includes the use of antidepressants.

Abstract

A study questioning the serotonin hypothesis of depression has prompted significant discussion about the efficacy of antidepressants. The research indicates that individuals with depression do not inherently have lower serotonin levels than those without depression, which undermines the idea that antidepressants work by correcting a chemical imbalance. Despite this, the study does not conclude that antidepressants are ineffective, but rather that their mechanism of action may be different from previously thought. The public reaction has been substantial, with concerns that the findings might lead to people abruptly stopping their medication, risking withdrawal symptoms. Medical professionals emphasize that antidepressants can be beneficial for many, especially in crisis situations, although their long-term effectiveness remains less clear. The debate also touches on the potential side effects of antidepressants and the importance of considering alternative treatments such as psychotherapy, exercise, or meditation, especially for less severe cases of depression. The study's authors and other experts stress the need for a nuanced approach to treating depression, acknowledging the interplay of genetic predispositions and environmental factors.

Opinions

Some psychiatrists have long been aware that the serotonin hypothesis is an oversimplification of depression's etiology.
The public's strong reaction to the study suggests that the serotonin hypothesis was widely accepted by the general public.
There is a fear among healthcare professionals that the study's findings could lead to patients discontinuing their medication without medical supervision.
Dr. Michael Bloomfield likens the use of antidepressants to painkillers for headaches, suggesting that the drugs' effectiveness is not solely dependent on correcting a deficiency.
Linda Gask from the Royal College of Psychiatrists views antidepressants as a quick-acting aid for many patients, particularly in acute phases.
Joanna Moncrieff, co-author of the study, points out the lack of long-term data on antidepressant efficacy due to the short-term nature of most drug trials.
The authors of the serotonin study emphasize the need for clear communication about the potential side effects of antidepressants.
Dr. Mark Horowitz, another study author, argues that depression is influenced by both genetic factors and environmental stressors, suggesting that treatment should be tailored accordingly.
Some experts advocate for a more holistic approach to treating depression, including addressing social and environmental factors.
Patients like Zoe highlight the importance of patient agency and informed decision-making regarding medication, especially for those with severe psychological conditions.

Depression: Have we all believed the “myth” about this disease?

Do you think anti-depressant pills work?

A study showing that depression is not caused by low levels of the “happiness hormone” known as serotonin has become one of the most popular medical articles.

This study sparked a wave of misleading claims about antidepressant medications, many of which increase the level of serotonin in the body.

The research does not show that medications are not effective. But the way it was dealt with raised questions about our view of mental illness.

After Sally had her first major psychiatric episode, in her early twenties, doctors told her that the medication she was prescribed was like “insulin for diabetics.” They told her it was necessary, that it would correct something chemically wrong in her brain, and that she should take it for life.

Her mother had type 1 diabetes, so she took this seriously.

Sarah continued to take the medication even though it was making her feel worse, and she began to have suicidal thoughts and then began receiving electroconvulsive therapy. However, the claim that she needed the medication like a diabetic needs insulin was not based on any medical evidence.

“It makes you feel betrayed by the people you trust,” Sally says.

Her reaction to the medications was severe, but the “chemical imbalance” message she was given was not unusual.

Many psychiatrists say they have known for a long time that low levels of serotonin are not the main cause of depression and that this paper says nothing new.

However, the unusually large public reaction suggests that this was news to many.

But some have gone from simply saying that antidepressant medications don’t work by fixing a chemical imbalance, to saying that they don’t work at all. Doctors fear that people will stop taking their medications suddenly and risk serious withdrawal effects.

The National Institute for Health and Care Excellence says that taking these medications should not be stopped suddenly except in cases of medical emergency, noting that slowly reducing the dose can reduce withdrawal symptoms.

What did the research show?

This latest research looked at 17 studies and found that people with depression did not appear to have different levels of serotonin in their brains compared to people without depression.

The results help rule out one possible way the drugs might work — by correcting deficiency levels.

Dr. Michael Bloomfield points out: “Many of us know that taking paracetamol can be useful for headaches, but I don’t think anyone believes that headaches are caused by insufficient paracetamol in the brain.”

Do antidepressants work?

Research suggests that antidepressants work slightly better than placebos during research. There is debate among researchers about the importance of this difference.

There is a group of people who have much better results after taking antidepressants — doctors don’t have a good way of knowing who these people are when prescribing medications.

Linda Gask, of the Royal College of Psychiatrists, says antidepressants are “something that helps a lot of people feel better quickly”, especially during times of crisis.

But Joanna Moncrieff, one of the authors of the serotonin paper, points out that most drug companies’ research is short-term, so little is known about how people are doing after the first few months.

How was the research talked about?

While there are risks of leaving depression untreated, some people will experience serious side effects from taking antidepressants — something the authors of the serotonin study say needs to be further clarified.

This can include suicidal thoughts and attempts, sexual dysfunction, emotional numbness, and insomnia, according to the National Institute for Health and Care Excellence.

Since last fall, UK doctors have been required to prescribe psychotherapy, exercise, exercise, or meditation to people with less severe cases of depression first, before trying medications.

A misleading commentary claimed that the study showed that prescribing antidepressants was “based on a myth.”

However, the study did not address the use of antidepressants at all.

Serotonin plays a role in mood, so changing its levels can make people feel happier, at least in the short term, even if they don’t have abnormally low levels to begin with. It may also help the brain make new connections.

Others claimed that this study shows that depression was never a disease of people’s brains, but a reaction to the environment in which they live.

“Of course both are true,” says Dr. Mark Horowitz, one of the paper’s authors. “A person’s genetic factors influence their sensitivity to stress,” he adds, for example.

But people who have an understandable response to difficult circumstances may be better helped by “relationship counseling, financial advice, or changing jobs” rather than medications.

However, Zoe, who lives in south-eastern Australia and suffers from major depression and psychosis, says rebranding depression as an “affliction” that would go away if “we just fix all the social problems” is too simplistic and overlooks people with illnesses. Psychologically more severe.

Psychosis runs in Zoe’s family, but her episodes are often triggered by stressful events, such as exam deadlines.

Zoe was able to “calculate” the side effects of medications to avoid severe attacks.

This is something all the experts who spoke to the BBC agree on — patients need more information, and it explained to them better so they can make these difficult calculations themselves.