A theoretical model published in Neuroscience and Biobehavioral Reviews proposes that attention deficit hyperactivity disorder (ADHD) may be better understood as a disorder of neural energy regulation rather than a deficit of attention itself. The model, developed by neurobiologist Mohammad Dawood Rahimi of Freie Universität Berlin, is termed Energy Deficit Hyperactivity Disorder (EDHD) and draws on findings from neuroscience, mitochondrial biology, and computational modelling.
The EDHD framework centres on the concept of “metabolic contingency”: the idea that individuals with ADHD do not lack the neurological capacity for attention, but rather experience an unstable supply of the metabolic energy required to sustain activity in high-demand cognitive networks. According to the model, this instability explains one of the most distinctive features of ADHD, namely the marked variability in performance. Stimulating or novel tasks are thought to temporarily optimise the brain’s energy allocation, enabling prolonged periods of intense focus. Monotonous tasks, by contrast, deplete limited metabolic reserves without generating the arousal feedback needed to maintain cognitive function.
Rahimi identifies mitochondrial function as central to this process, arguing that brain regions responsible for planning, self-regulation, and executive function do not consistently receive the sustained energy input required for reliable performance. Behaviours commonly characterised as restlessness or impulsivity are reframed within this model as compensatory strategies to stimulate arousal and stabilise energy levels.
The model also highlights the role of metabolic recovery, including sleep quality, rest, and nutritional factors, in determining available cognitive capacity, suggesting these should be considered in holistic treatment approaches. The author emphasises that EDHD is a theoretical framework intended to synthesise existing research, not a clinical diagnostic tool.
Source: Rahimi MD. Energy Deficit Hyperactivity Disorder (EDHD): A Neurobiological Energy Dysregulation Model for ADHD. Neuroscience and Biobehavioral Reviews (2026). DOI: 10.1016/j.neubiorev.2026.106616
The EDHD framework centres on the concept of “metabolic contingency”: the idea that individuals with ADHD do not lack the neurological capacity for attention, but rather experience an unstable supply of the metabolic energy required to sustain activity in high-demand cognitive networks. According to the model, this instability explains one of the most distinctive features of ADHD, namely the marked variability in performance. Stimulating or novel tasks are thought to temporarily optimise the brain’s energy allocation, enabling prolonged periods of intense focus. Monotonous tasks, by contrast, deplete limited metabolic reserves without generating the arousal feedback needed to maintain cognitive function.
Rahimi identifies mitochondrial function as central to this process, arguing that brain regions responsible for planning, self-regulation, and executive function do not consistently receive the sustained energy input required for reliable performance. Behaviours commonly characterised as restlessness or impulsivity are reframed within this model as compensatory strategies to stimulate arousal and stabilise energy levels.
The model also highlights the role of metabolic recovery, including sleep quality, rest, and nutritional factors, in determining available cognitive capacity, suggesting these should be considered in holistic treatment approaches. The author emphasises that EDHD is a theoretical framework intended to synthesise existing research, not a clinical diagnostic tool.
Source: Rahimi MD. Energy Deficit Hyperactivity Disorder (EDHD): A Neurobiological Energy Dysregulation Model for ADHD. Neuroscience and Biobehavioral Reviews (2026). DOI: 10.1016/j.neubiorev.2026.106616
