Neither of us had a diagnosed mental illness going into our surgeries, so this article started from research rather than our own pre-op experience. It became personal anyway. James has written honestly on this site about the depression that has crept up on him more than two years after surgery, and about the frustrating standstill with his GP, who wants his ADHD and autism assessment completed before engaging properly with anything else, at a time when adult diagnostic services are so overwhelmed that the assessment itself is not moving. That situation is exactly why we think this topic matters, even though it did not apply to either of us before the operation.
A history of mental illness does not automatically rule you out
Having depression, anxiety, or another mental health condition in your history is common among people considering bariatric surgery, and it does not automatically disqualify you. Most bariatric programmes include a psychological evaluation as a standard part of the pre-surgery process, not as a hurdle designed to filter people out, but as a way of understanding your history and making sure the right support exists both before and after surgery.
What that assessment is actually looking for
A typical evaluation combines a clinical interview with structured tools, sometimes including questionnaires screening for depression, anxiety, and disordered eating patterns. The aim is to build a real picture of your personal and family history, and to flag anything that might need extra planning around your surgery date, rather than to catch people out or pass judgement on your suitability as a person.
Where it can affect timing rather than eligibility
Some conditions do affect timing rather than ruling someone out entirely. Active suicidal ideation, serious unmanaged mental illness such as psychosis or bipolar disorder, severe unmanaged depression or anxiety, and active symptoms of post traumatic stress disorder are commonly treated as reasons to stabilise first, with surgery proceeding once symptoms are under better control. That is about safety and sequencing, not a permanent no, even if it can feel like one in the moment.
What can happen after surgery, which is the part nobody warns you about enough
Existing mental health conditions can go either way after bariatric surgery, and so can conditions that were never diagnosed beforehand at all. Some people find genuine improvement as their physical health and self-image change. Others, James included, find that low mood can surface or worsen well after the physical recovery is finished, sometimes years later, once the day to day reality of a permanently smaller stomach has had time to actually sink in. Ongoing psychological support after surgery, not just before it, is worth asking about directly when choosing a surgical team, because the standard model still leans heavily toward front-loading support before the operation and tapering it off afterward, right when some people need it more.
What we would say if you are worried this counts against you
If you have a mental health history, the honest answer is that it might shape the timing or the support plan, but it should not be treated as an automatic barrier. Being upfront with your team about your history, rather than downplaying it to get through the assessment faster, tends to lead to better support once you are actually in recovery. And if, like James, something surfaces well after the fact that was never part of the original conversation, do not assume the door has closed just because your GP wants boxes ticked in a particular order. Keep pushing, even when the system is not moving quickly.
Sources
Peer reviewed research on psychological screening, assessment criteria, and post-surgical mental health outcomes in bariatric surgery candidates.
About this content
This blog is written by James and Kirsten, a couple from the UK who had gastric sleeve surgery together in March 2024.
We started this blog because we couldn't find any sources of content that details before surgery, the surgery and then life post surgery - so we decided to write one ourselves.
Everything on this site is based on our own experience and the research we have done along the way. It is not medical advice. Gastric sleeve surgery is a serious procedure and every patient's journey is different. Please always consult your own bariatric team or GP before making any decisions about your health or treatment.
Some posts on this site may contain featured or sponsored content, or affiliate links. Where this is the case, it will always be clearly stated at the top of the article. Our opinions are always our own.
Publish Date: 5 August 2026 | Last Reviewed: 9 August 2026 | Next Planned Review: 9 February 2028