Why Can't I Stop Binge Eating? Understanding the Physiological and Cognitive Drivers
In the previous blog in this series, I looked at the differences between binge eating, emotional eating and binge eating disorder, and why the distinctions matter.
This blog picks up from there and asks the question that tends to follow: why does this keep happening, and what is actually driving it?
People who binge eat are, almost without exception, people who have tried very hard not to. They have made rules, set limits, started again on Mondays. They have white-knuckled their way through difficult moments and talked themselves out of eating when everything in them said otherwise….And still it keeps happening.
Binge eating has drivers - physiological and cognitive - that operate largely beneath the level of conscious decision-making.
For many people, the picture is relatively straightforward: years of dieting and restriction created the physiological and cognitive conditions for binge eating to develop. For others, the roots go deeper, into psychological and historical territory that this series will explore in the next post. Most people find elements of both in their own history.
Understanding what's driving your binge eating doesn't make the pattern disappear overnight- but it can change the relationship you have with it. And that shift in understanding is often where meaningful change begins.
If you haven't read the first post in this series yet, you might find it a helpful starting point before reading on.
The physiological drivers - what's happening in your body
Restriction and under-fuelling
This is the most direct and well-evidenced physiological driver of binge eating. It is also the most commonly overlooked because restriction doesn't always look like a formal diet.
When the body receives less food than it needs - whether that be through deliberate calorie reduction, skipping meals, cutting out food groups or simply not eating enough across the day - it responds at a neurobiological level. Food preoccupation increases, cravings intensify and the brain's reward system becomes primed to seek out precisely the foods that have been avoided or restricted - and the threshold for a binge episode is significantly lowered.
Essentially a survival mechanism, the body can't distinguish between a calorie deficit caused by famine and one caused by a well-intentioned diet plan, so its response is the same in both cases: do whatever it takes to get more food.
The cruel irony is that the very strategies most people use to try to stop binge eating - such as eating less, cutting back, being stricter - tend to amplify the physiological drive to binge. This is why more willpower and stricter plans so rarely produce lasting change.
You can see my overview of the restrict-binge cycle half way down this page.
Blood sugar dysregulation
Irregular eating patterns (common in people who restrict during the day) can also create significant fluctuations in blood sugar that directly affect mood, energy, concentration and impulse control. The period of low blood sugar that follows a long gap between meals can feel like intense cravings, irritability and a powerful drive to eat, particularly foods that will raise blood sugar quickly.
For someone already in a difficult relationship with food, this physiological state can be the trigger that tips a manageable moment into a binge episode.
The neurobiological reward system
Food, particularly palatable food high in fat, sugar or salt, activates the brain's dopamine reward system. For people who binge eat, research suggests this system may function differently with some evidence of reduced baseline dopamine activity that intensifies the pull toward highly palatable food as a source of relief or reward.
Chronic restriction compounds this further. When certain foods are forbidden, they acquire an intensified reward value in the brain - which is partly why the foods people most try to avoid are often the ones they find hardest to stop eating once they start.
Over time, binge eating itself can become a neurological habit - a well-worn pathway the brain returns to because it has worked before as a source of relief or temporary escape. This is why binge eating can feel compulsive and automatic, particularly during periods of stress.
The cognitive drivers - the role of thinking patterns
How someone thinks about food and their eating plays a significant role in maintaining the binge-restrict cycle — and these thinking patterns are often so habitual they feel like facts rather than beliefs.
All-or-nothing thinking
The belief that eating must be either perfect or ruined is one of the most common cognitive drivers of binge eating. Once a food rule has been broken - one biscuit when the plan was none - the internal logic shifts to: I've already failed, I might as well eat everything. This is sometimes called the abstinence violation effect, and it is extremely well-documented in the research on disordered eating.
The cruelty of this pattern is that the food rules themselves (the restriction) create the conditions for the failure that triggers the binge. Without the rule, there is no violation. Without the violation, there is no f*** it moment.
Food moralising
Labelling foods as good or bad, clean or dirty, allowed or forbidden creates a moral framework around eating that is psychologically costly. Eating a ‘bad’ food doesn't just feel like a food choice, it feels like a moral failure with accompanying shame, self-criticism and a need to compensate. This moral loading maintains the restrict-overeat cycle and makes it significantly harder to develop a more flexible, easeful relationship with eating.
Overvaluation of shape and weight
For people who place significant importance on their body size or shape as a measure of their worth or acceptability, the stakes of every eating decision become enormously high. This hypervigilance around food and body is exhausting to maintain - and the crash i.e. the binge, is partly a response to that exhaustion.
THe LAYERS OF BINGE EATING
The physiological and cognitive drivers described above explain a great deal about why binge eating develops and why it persists - and, for many people, addressing them directly produces meaningful and lasting change.
My next blog post adds another layer to that picture. It looks at the psychological and historical roots of binge eating - the emotional drivers, the role of the nervous system and what both research and clinical experience point to as the two ‘earlier beginnings’ that almost always precede binge eating. It is the part of the picture that tends to make the most sense of why this pattern has been so persistent and why changing it involves more than stabilising your eating patterns alone - even though this is often the essential first step that makes everything else possible.
In the meantime, if you'd like to find out more about specialist support for binge eating disorder and disordered eating, you can explore my Nutritional Counselling service here.
Take a nourishing step forward today
If this resonated with you, you don't have to navigate this alone. I offer nutritional therapy and behaviour change support for binge eating disorder, emotional eating and disordered eating, and I'd love to help you find your way back to more ease and trust with food.
Explore my support options or book a confidential, no-obligation enquiry call to see if working together feels right.
