ADHD and Obesity: What a Weekend of ADHD Training Taught Me

A Weekend of ADHD Training, and a Penny-Drop Moment

Over the weekend I completed the two-day workshop that concludes the ADHD training program delivered by the Royal Australian College of General Practitioners on behalf of the Victorian Government. The cohort I trained alongside is the first group of GPs in Victoria to be credentialed to diagnose ADHD and to prescribe stimulant medication for its management.

That is a genuinely significant shift. Until now, an adult in Victoria seeking an ADHD diagnosis had to see a psychiatrist, and a child had to see a paediatrician or psychiatrist. Waits of six to twelve months were common, and a comprehensive private assessment frequently cost upwards of two thousand dollars. For a good number of my patients, that combination of cost and delay meant the question simply never got asked.

I expected the training itself to be a useful technical update. I did not expect it to reframe how I think about a large part of my existing clinical work.

I look after a substantial cohort of patients with obesity and metabolic disease. Many of them are intelligent, well-informed and genuinely motivated. They can tell me exactly what they should be eating and how often they should be moving. Many of them have done it successfully — for three weeks, or three months, or a year. Then something slips, the structure collapses, and the weight returns.

For years the honest answer I gave myself was that obesity is a chronic relapsing condition and setbacks are part of its natural history. That remains true. But across those two days of training, a pattern I had been observing for over a decade finally had a name attached to it. For a meaningful subgroup of my patients, the barrier was never knowledge, motivation or willpower. It is executive function — the brain's ability to plan, initiate, sequence, remember and regulate behaviour over time.

That is exactly the capacity that ADHD affects. And it is exactly the capacity that almost every weight management plan silently assumes is intact.

The Link Between ADHD and Obesity Is Stronger Than Most People Realise

This is not a fringe observation. A widely cited meta-analysis published in the American Journal of Psychiatry in 2016 pooled data from dozens of studies and found that adults with ADHD had roughly 1.5 times the odds of obesity compared with people without ADHD. The association was also present in children, and it persisted after accounting for a range of confounders.

The relationship appears to run in both directions. ADHD traits make weight gain more likely, and some of the consequences of obesity — poor sleep, obstructive sleep apnoea, chronic fatigue, low mood — further degrade attention and self-regulation. It becomes a reinforcing loop.

What struck me most is how rarely this comorbidity gets named in a weight management consultation. ADHD is often still pictured as a disruptive boy in a classroom. In adults, and particularly in women, it frequently presents instead as chronic disorganisation, internal restlessness, procrastination, emotional reactivity and a lifelong sense of underperforming relative to effort. Those patients do not arrive in my clinic saying they might have ADHD. They arrive saying they have failed at dieting fourteen times.

Why ADHD Makes Weight Management Harder

The training clarified several distinct mechanisms, and separating them out has genuinely changed the questions I ask.

Impulsivity and inhibitory control

ADHD is associated with reduced inhibitory control — difficulty with the internal brake that sits between an impulse and an action. In practice that means the gap between noticing food and eating it is shortened. Patients describe eating something before they have consciously decided to.

Reward sensitivity and delay discounting

ADHD brains tend to weight immediate rewards far more heavily than delayed ones. Highly palatable food delivers a reliable, immediate reward. The benefit of weight loss arrives in months. Any plan that depends on valuing a distant payoff over an immediate one is working against the neurology.

Interoception — not reliably noticing hunger and fullness

This was the part I found most clinically useful. Many people with ADHD have reduced interoceptive awareness, meaning weaker internal signalling about hunger, fullness and thirst. The common pattern is forgetting to eat while absorbed in something, becoming ravenous late in the day, then eating well past comfortable fullness. Advice like "eat mindfully and stop when you are satisfied" assumes a signal that may not be arriving clearly.

Emotional dysregulation

Emotional intensity and difficulty down-regulating distress are core features of adult ADHD for many people. Food is a fast, legal, accessible and socially acceptable way to modulate an uncomfortable emotional state. Calling this "emotional eating" is accurate but incomplete — it is often emotional regulation.

Time, planning and the collapse of routine

Difficulty with time perception, task initiation and sequencing makes meal planning, shopping, batch cooking and consistent appointment attendance disproportionately hard. Convenience food is not a preference so much as the path of least resistance when the planning machinery is overloaded.

Sleep

Delayed sleep phase and irregular sleep are very common in ADHD. Short and poor-quality sleep adversely affects appetite regulation, increases cravings for energy-dense food, and reduces the cognitive reserve available for self-regulation the following day.

Binge Eating Deserves Specific Attention

Binge eating disorder and subthreshold loss-of-control eating are substantially over-represented in people with ADHD, which makes sense given the shared features of impulsivity and emotional dysregulation.

This matters because binge eating is treatable in its own right, and because it is routinely missed. Patients are often ashamed of it and will not volunteer it. If I do not ask directly about loss of control, eating in secret, eating to the point of discomfort, and how they feel afterwards, I will not hear about it — and no GLP-1 prescription or dietary plan will substitute for addressing it properly.

How This Changes My Practice

Some of what follows I was already doing. The training sharpened it considerably.

The single biggest shift is this: when a patient has repeatedly failed with advice that should have worked, I now treat that as clinical information rather than a character assessment. Repeated failure of a reasonable plan is a prompt to ask whether the plan was ever matched to how that person's brain actually works.

Does Treating ADHD Help With Weight?

Honestly, the evidence here is still developing and I want to be careful not to overstate it.

There is a reasonable body of work suggesting that recognising and treating ADHD improves engagement, adherence and outcomes in weight management, and some literature indicating that unrecognised ADHD is associated with poorer outcomes following bariatric surgery. The mechanism is plausible — better executive function means better capacity to implement a plan.

What I would not claim is that ADHD medication is a weight loss treatment. Stimulants can suppress appetite, but using that as a weight loss strategy is not appropriate, and appetite suppression during the day can simply shift eating into the evening. The goal of treating ADHD is to treat ADHD. Improved capacity to manage weight is a welcome downstream effect, not the indication.

Strategies That Work Better for ADHD Brains

These are the principles I am now applying far more deliberately:

• Design the environment, don't rely on willpower. What is visible and easy gets eaten. Changing what is within arm's reach outperforms resolving to resist it.
• Reduce decisions. A small set of repeated default meals beats a varied plan that requires daily decision-making.
• Make the healthy option the low-friction option. Pre-prepared protein, pre-cut vegetables, and groceries delivered on a recurring order remove steps where plans break down.
• Protein early. Front-loading protein and eating earlier in the day reduces the late-day deficit that drives evening overeating.
• Externalise memory. Alarms, visible checklists, and shared calendars do the remembering. Prospective memory should not be the load-bearing element of a treatment plan.
• Use accountability deliberately. Shorter review intervals, a check-in partner, or structured programs provide the external scaffolding that internal consistency struggles to supply.
• Protect sleep as a clinical priority. Treating sleep disruption and screening for sleep apnoea is often more productive than another dietary tweak.
• Change one thing at a time. Comprehensive overhauls are appealing and fragile. One sustainable change beats six that last a fortnight.

Should You Consider ADHD Assessment?

If the following sounds familiar, it may be worth discussing with your GP:

1. You have repeatedly lost weight successfully and then been unable to maintain the structure that achieved it
2. You frequently forget to eat, then eat large amounts later
3. You experience loss of control around food, particularly in the evening or when stressed
4. Disorganisation, procrastination, lateness and difficulty finishing tasks have been lifelong rather than recent
5. These patterns were present well before your weight became a concern

Please note that online questionnaires and screening tools are not diagnostic. They can be a useful starting point for a conversation, nothing more.

Why I Am Writing This

I came away from the weekend with an uncomfortable but useful thought: over my years in practice, I have almost certainly sat across from patients with undiagnosed ADHD and given them a perfectly sensible weight management plan that their brain was poorly equipped to execute — and then both of us quietly concluded that they had not tried hard enough.

That is the part I intend to do better. If you have spent years believing your weight is a failure of discipline, it is worth considering whether something else is going on that has never been properly assessed.

Book a Consultation

If you are managing obesity or metabolic disease and the patterns described here resonate with you, I am happy to discuss it. Weight management consultations are available at Knox General Practice and Family Medicine in Bayswater, with telehealth available where appropriate.

Call (03) 9100 3130 or book online via HotDoc.

Important: This article is general information based on current evidence and my own professional development, and is not a substitute for individual medical advice. ADHD is a clinical diagnosis that requires proper assessment, and the symptoms described here can also be caused by a number of other conditions. Please speak with your own doctor about your circumstances.