Have you ever noticed that during an eating disorder your brain just… stops working normally?
You try to focus on a conversation, but your mind keeps drifting back to food. You try to concentrate on work or studies, but your thoughts feel scattered and difficult to hold onto for long. Your emotions might feel overwhelming, anxiety can become stronger than ever, and your thoughts often start looping in obsessive patterns.
Many people see these experiences and conclude that this is simply proof that eating disorders are purely mental illnesses. And while there are certainly psychological aspects involved, there is something very important that often gets overlooked in this conversation: the powerful connection between malnutrition and the brain.
One of the biggest light-bulb moments during my own recovery was realizing that many of these symptoms were not just psychological problems. In many cases, they were the result of a malnourished brain trying to survive. When the brain does not receive enough energy, it simply cannot function the way it is supposed to. And once you understand what malnutrition actually does to the brain, a lot of eating disorder symptoms suddenly start to make much more sense.
The Moment I Realized Something Was Wrong
When I think back to my own eating disorder, I remember so many situations where it felt like my brain had been completely hijacked.
For example, I would sit in a café with a friend, trying to have a normal conversation. My friend would be talking, but instead of listening, my mind kept jumping back to the same thoughts over and over again. I would find myself thinking about whether I had ordered the “healthy” option, whether the food might contain too much oil or sugar, how many calories it might have, and whether I should absolutely avoid ordering dessert. It felt like my brain was running a completely different program in the background that I simply couldn’t turn off.
At the time I remember thinking, What’s wrong with me? Why can’t I focus on this conversation? Why is all I can think about food?
There was even a period where I was deeply involved in the raw food community, following a very restrictive high-carb, low-fat vegan diet. At the time I genuinely believed I had discovered my passion. I loved searching for recipes, creating meals, talking about food, and experimenting in the kitchen. A friend and I even started teaching recipe classes and eventually published Estonia’s first raw food recipe book.
But looking back now, after going through recovery, I can see it very differently. All of that constant thinking about food, searching for recipes, talking about food, and planning meals wasn’t passion. It was hunger. I was extremely deprived, and my brain was doing exactly what a starved brain is biologically designed to do: focus on food.
The Missing Piece in Eating Disorder Recovery
We often talk about eating disorders as mental illnesses. And yes, there are absolutely psychological components involved – things like perfectionism, control, trauma, identity, and body image struggles.
But something that is often missing from the conversation is how profoundly malnutrition affects the brain.
The brain is actually the most energy-demanding organ in the body. Even though it only makes up about two percent of your body weight, it uses around twenty percent of your body’s total energy. Its preferred fuel source is glucose, which comes directly from the food we eat.
So when someone restricts food for months or years, the brain simply does not receive the fuel it needs to function properly. And when that happens, a cascade of neurological changes begins to occur.
People often start experiencing things like increased anxiety, obsessive thoughts about food, difficulty concentrating, emotional instability, irritability, and depression. These symptoms are frequently interpreted as purely psychological problems, but in many cases they are actually the brain reacting to starvation.
Over the years I have had many people reach out to me after reading my book or working with me as clients. Some of them told me they had spent years in therapy trying to unpack trauma, understand their perfectionism, or analyze their need for control. But despite all that work, their eating disorder symptoms never truly improved.
Then once they began properly nourishing their bodies and brains, things finally started shifting. For many of them, understanding the biological side of eating disorders was the missing piece that had been overlooked for years.
What Malnutrition Actually Does to the Brain
Research using brain scans shows that starvation doesn’t only affect body weight – it actually changes the brain itself.
MRI studies have found that during periods of malnutrition, brain volume decreases, particularly in grey matter. Grey matter is responsible for many of the functions that people struggling with eating disorders often feel they are losing, including decision making, reasoning, emotional regulation, impulse control, and memory.
Malnutrition also affects neurotransmitters in the brain. Production of serotonin and dopamine decreases, which are chemicals responsible for mood, motivation, and the ability to experience pleasure. At the same time, the amygdala – the brain’s fear center – becomes more active, while the prefrontal cortex, the part of the brain responsible for rational thinking and long-term decision making, becomes less active.
What this creates is a brain that is more anxious, more reactive, more obsessive, and less able to regulate those reactions. In other words, a brain that is biologically primed for the very symptoms people associate with eating disorders.
The Minnesota Starvation Experiment
One of the most powerful demonstrations of this comes from a famous study called the Minnesota Starvation Experiment.
In the 1940s, researchers placed healthy men on a semi-starvation diet for several months. Before the experiment these men were eating over 3,000 calories per day, but during the study they were restricted to around 1,500 calories per day. Importantly, these participants had no history of eating disorders or mental illness.
Yet after only a few weeks of restricted eating, they began developing symptoms that looked strikingly similar to eating disorders. They became obsessed with food, constantly talked about food, and began collecting recipes. Many experienced anxiety, irritability, depression, and difficulty concentrating. Some developed binge eating behaviors once food became available again, while others withdrew socially and became emotionally unstable.
The most important part of the study is what happened afterward. When the participants were allowed to eat enough again, these symptoms disappeared. They recovered without years of therapy or psychological treatment. Their symptoms improved simply because their bodies and brains were finally receiving enough nourishment.
This experiment demonstrated something incredibly important: many of the symptoms we label as psychological issues can actually be the result of a starved body and brain. A malnourished brain is simply a malfunctioning organ.
Why You Can’t Think Yourself Better
This is where many people get stuck in recovery. They try therapy, journaling, meditation, body image and mindset work, but their thoughts still feel obsessive and disordered.
The reality is that you cannot mentally heal a physically starving brain.
A malnourished brain simply does not have the biological capacity to regulate emotions properly or create new thinking patterns. It struggles to calm fear responses, reduce obsessive thoughts, and build new neural pathways.
Neuroscience shows that neuroplasticity – the brain’s ability to change and rewire itself – works best when the brain has enough energy. Without sufficient fuel, the brain simply cannot function optimally, no matter how much mindset work someone does.
This is why if someone is still restricting, compensating, or underfeeding themselves, their brain does not have the resources needed to rewire. Mental work often becomes much more effective only after the brain has been properly nourished.
My Turning Point
For me, the turning point came when I finally started eating enough consistently. I stopped calorie restricting, stopped compensating, and allowed my body to begin recovering physically.
And something surprising happened. It felt like my brain started working normally again.
My constant food obsession faded. I could focus on conversations again and concentrate on my work. My mood improved and I noticed that my sense of humor returned. I slept better, felt calmer, and started becoming interested in things other than food.
It truly felt like my brain had come back online. And it happened simply because my brain finally had the energy it needed to function.
The Good News: Your Brain Can Recover
The brain is incredibly resilient. Research shows that many of the brain changes caused by malnutrition are reversible.
Brain volume can restore, grey matter can rebuild, neurotransmitter production can normalize, and cognitive function often improves significantly once the body receives consistent nourishment again.
Recovery is not just about changing your thoughts. It is also about properly nourishing your brain and your body.
Physical Recovery Comes First
This is why eating enough – truly enough – is always the foundation of recovery. Physical recovery creates the conditions for mental recovery to become possible.
This means stopping restriction, ending compensation behaviors, allowing your body to restore weight if needed, and giving your body rest and time to heal. Once the brain receives the energy it needs, the mental side of recovery often becomes much easier to work on.
Therapy can start working more effectively, mindset shifts become more possible, and body image work becomes more productive. But without enough fuel, mental work alone often cannot create lasting change.
Final Thoughts
If you are currently struggling with an eating disorder and noticing many mental symptoms – obsessive thoughts, anxiety, difficulty concentrating, emotional overwhelm – please understand this: your brain may simply be responding exactly the way a malnourished brain responds.
These symptoms are not signs that you are broken or beyond help. They are signs that your brain needs nourishment.
Feed yourself. Rest. Stop restricting. Give your brain the energy it needs to function again.
Because when the brain receives enough fuel, the mental side of recovery can finally begin to improve.
Join My FREE Masterclass
If you’d like to learn more about how recovery actually works and what it takes to move from struggling to full recovery, I’d love to invite you to join my free masterclass HERE.
In this training, I walk through the recovery process step by step and explain the key things that help people move from feeling stuck in recovery to becoming fully recovered.
Thank you so much for reading, and I hope this helped you understand your brain a little better.
You deserve full recovery. 💛
– Elisa
