Metabolic Dysfunction in Eating Disorders

The term metabolism means different things in different settings, but a clear medical description is essential to understand eating disorder recovery.

The biological definition is the process through which the body utilitizes the food we eat both through energy expenditure and storage.

There are many factors that influence a person’s metabolism: genetics, age, lifestyle and exercise to name a few. Metabolism also can change in hours, say after a meal, over days to weeks like with increased exercise or over years through aging.

Metabolism regulation occurs largely through the gastrointestinal hormonal system that adjusts how energy is used. Other hormonal systems alter metabolism over longer periods of time as well.

Eating consistently regulates metabolism so that the body can rely on sufficient energy through food and then adjust metabolism as needed for external factors that change in the short-term.

Eating inconsistently, often irrespective of the body’s typical needs, stresses overall metabolism greatly. The body will to attempt to adjust the hormonal signals that affect metabolism due to these changes but struggles to do so effectively when eating is erratic, intermittent and completely unrelated to hunger.

The first step in eating disorder recovery involves consistent meals and snacks at fairly regular times through the day. The reason a meal plan is so important is to help the body return to stable metabolic function. Doing so helps re-establish homeostasis (overall stable biological functioning of the body) which is much less balanced during period of disordered eating.

The biological underpinnings of an eating disorder helps explain how disruptive these symptoms are. In this blog, I have written at length about the psychological and emotional effects of an eating disorder. Unlike other psychiatric disorders, eating disorders cause biological symptoms, specially metabolic, which stress the body immensely. It takes an enormous amount of effort for the body to maintain stability during long periods of disordered eating. Normal lab results during these times belies the truth of how much damage an eating disorder causes.

Metabolism is not a contest about whose is fast and slow. That definition reflects the weight bias in our culture and the ignorance about metabolic function. Instead, metabolism describes how our body manages energy intake and needs.

Understanding how eating disorders cause metabolic dysfunction is necessary to know how these disorders affect our health. Recovery needs to prioritize normalizing metabolism as a first step through regular eating.