UK Trial Tests Diet as Bipolar Depression Treatment

For the first time, researchers are testing whether food could be medicine for people living with bipolar depression.

The ENERGISE-BD trial, launching in Scotland and expanding to Birmingham in early 2027, will study 200 people with bipolar disorder to see if diet can ease their depressive symptoms. Half will follow a high fat, low carbohydrate ketogenic diet, while the other half will stick to standard NHS healthy eating guidelines.

The study matters because bipolar depression often doesn't respond well to traditional antidepressants. Many people with bipolar disorder experience long term depressive symptoms between their mood episodes, significantly affecting their daily lives and wellbeing.

The research team from the Universities of Edinburgh and Birmingham designed the £7.9 million trial in partnership with people who have lived experience of bipolar disorder. The idea came directly from patients who reported feeling better after trying a ketogenic diet on their own.

Scientists believe the ketogenic diet might help because it changes how the brain produces energy. Without carbohydrates, the body creates chemicals called ketones, which may fuel brain tissue more efficiently than regular glucose. This shift in brain chemistry could potentially improve mood and energy levels.

Over 12 weeks, trained dietitians will support participants as they follow their assigned diet alongside their regular medications. Researchers will track changes in mood, energy, and other depressive symptoms. About half the volunteers will also have brain scans to show how changes in brain chemistry connect to improved mental health.

Why This Inspires

This trial represents a fundamental shift in how we think about treating mental illness. Instead of only relying on medications, researchers are exploring whether something as accessible as food could help millions of people manage their symptoms.

The study's focus on practical questions sets it apart too. Researchers will examine how easy each diet is to follow in real life and what it might cost the NHS to implement. They want solutions that actually work for people's everyday lives, not just in laboratory settings.

Perhaps most importantly, people with bipolar disorder helped design every aspect of this research. Their voices shaped the questions being asked and how the study will unfold. When patients report something helps them, scientists are listening and testing it rigorously.

Professor Daniel Smith from the University of Edinburgh calls the trial "potentially groundbreaking." His co-lead Steven Marwaha emphasizes they're recruiting from diverse backgrounds to understand if diet could work for the full range of people living with bipolar disorder.

The research opens exciting possibilities for treating mental health conditions through nutrition, though experts caution we're still in early stages of understanding. If successful, this could point toward new treatment options that put more control in patients' hands.