BBC Doctor Issues Stern Warning Over 'Cortisol Face or Belly' Social Media Claims
Dr Xand van Tulleken has delivered a forceful rebuttal to viral social media claims suggesting that high cortisol levels cause specific fat distribution patterns known as 'cortisol face' or 'cortisol belly'. Appearing on BBC Morning Live, the doctor dismissed these assertions as 'total garbage' and urged the public to disregard them completely.
The Cortisol Misinformation Epidemic
Social media platforms have been flooded with videos claiming that what influencers term 'moon face' – characterized by facial swelling or increased cheek fat deposits – results directly from elevated cortisol levels. Similarly, 'cortisol belly' has been promoted as another consequence of this stress hormone.
'If you have seen on social media any portrayal of people getting what you might call a moon face... Similarly cortisol belly is another thing that's talked about. In both cases, this is complete garbage and you should disregard it utterly,' Dr van Tulleken told presenters Helen Skelton and Rav Wilding.
How Cortisol Actually Functions
Cortisol is a vital steroid hormone produced by adrenal glands that performs essential functions including:
- Managing stress response
- Regulating metabolism
- Controlling blood pressure
- Modulating immune function
'Cortisol is an essential hormone that you need to stay alive. It is not a villain,' emphasized Dr van Tulleken. 'It controls loads of things in your body... It is a vital hormone that we need, not a villain.'
The Dangerous Supplement Narrative
The doctor highlighted how influencers often present 'seductive scientific-sounding explanations' about cortisol to promote supplements or specific treatments. 'These influencers that are telling you this are giving you this sort of slightly seductive scientific sounding explanation with a hormone that does affect lots of things in your body and saying this is the thing you need, buy the supplement to balance it,' he warned.
Dr van Tulleken further clarified that exercise cannot change fat distribution patterns. 'You cannot change your fat distribution pattern. So if you do situps, you won't get less fat around your tummy. That isn't how your body works.'
When Cortisol Actually Affects Fat Distribution
The doctor acknowledged that extremely high cortisol levels from medical conditions can cause fat redistribution, but stressed these are rare circumstances requiring proper diagnosis:
- Tumors producing excessive cortisol
- Steroid medications mimicking cortisol effects
'In those cases that very high can cause fat redistribution... So you do have this story that cortisol can redistribute fat, but that is part of a medical condition that needs to be diagnosed and managed properly,' he explained.
Medical textbooks describe potential effects including dorsal hump fat accumulation, central adiposity, or facial adiposity – but these occur only with pathological cortisol levels far beyond normal stress responses.
The Daily Cortisol Rhythm
Dr van Tulleken detailed how cortisol naturally fluctuates throughout the day: 'It's produced in a rhythm through the day. So it's the hormone that kind of gets us out of bed in the morning... And then the system can also release more cortisol if you encounter other kinds of stress.'
Both psychological stress (like workplace pressure) and physical stress (such as exercise) can temporarily elevate cortisol levels – a normal physiological response rather than a pathological condition.
