ADHD and forgetting to eat: why meals get missed, even when you know you need them
You meant to have lunch after that email. Then somebody called, you opened another tab, and now it is half past three. There is food in the kitchen. You bought it yourself. Somehow, eating it never made it into the afternoon.
ADHD can make eating regularly difficult for several reasons: getting absorbed in something else, trouble moving from a task to making food, or finding planning and preparation overwhelming. Reduced appetite can also play a part, including as a side effect of medication. Those experiences can overlap, but they need different responses.
If you also have IBS, the familiar instruction to “eat regularly” can feel particularly unhelpful. You already know what lunchtime is. The difficult part is getting from knowing to actually eating.
Why do I forget to eat when I have ADHD?
“I forgot to eat” can mean you didn’t notice the time. It can also mean you thought about lunch four times and never got as far as making it.
Perhaps you opened the fridge, found nothing you could face preparing, and closed it again. By late afternoon, the food is still untouched, but the point where lunch went wrong matters.
There is research behind taking these difficulties seriously. A 2025 study of 961 adults, including 416 who reported ADHD without autism, found more eating difficulties in the ADHD group than among participants reporting neither condition. Participants described difficulties including recognising hunger and fullness. The study relied on self-reported diagnoses and questionnaires; it cannot tell us how often all adults with ADHD miss lunch, or prove what will help a particular person.
The findings make a case for paying attention to eating difficulties in adults, although they leave important questions about how best to help.
Try looking at the point where eating stopped being possible. Was lunch absent from your thoughts, did food feel unappealing, or did getting it ready feel like too much? You may have a different answer on different days.
When you remember lunch but cannot leave what you are doing
Imagine you are halfway through something that has finally become interesting. Lunch occurs to you. You decide to finish one small part first. Unfortunately, the small part has several smaller parts.
An alarm can make you notice the time. It cannot finish the sentence, save your work or deal with the feeling that stopping now will make it difficult to restart.
If this sounds familiar, make room for the stopping as well as the eating. Before a lunch break, leave yourself a one-line note about where to resume: “Reply to the second question”, rather than a whole new to-do list. Choose a stopping point you can reach, then put the food somewhere you can access without starting another project.
If your job has no usable break, that also matters. A reminder that appears during a meeting you cannot leave is unlikely to solve much. A protected break or a conversation about your working arrangements may be more useful than a louder notification.
These are practical experiments, not a treatment protocol proven to work for everyone with ADHD. Keep the ones that make eating easier; you do not need to maintain a system merely because it looked promising on Sunday.
When you are not hungry, even though you have barely eaten
Forgetting and having little appetite can look similar by late afternoon. A plate you have no interest in eating needs a different approach from a plate you never remembered to make.
If your appetite changed after starting or adjusting ADHD medication, tell your prescriber. For example, the NHS lists loss of appetite as a possible side effect of methylphenidate. It does not happen to everyone, and a new eating problem should not automatically be attributed to medication.
Please check the instructions for your particular medicine rather than following a universal “take it after breakfast” tip. Food instructions vary even between methylphenidate brands. The NHS guidance on taking methylphenidate explains those differences. Do not change your dose, timing or medication yourself to manage appetite.
If a full meal feels difficult, a smaller, familiar meal or snack may be a more manageable starting point while you seek advice about getting enough overall. That should not become a way of accepting steadily less food. Persistent low intake, unintended weight loss or ongoing nausea needs attention from your GP, prescriber or dietitian.
You do not have to wait for a routine medication review to raise a problem that is affecting your eating.
When there is food in the fridge but no obvious lunch
There is a particular frustration in opening a well-stocked fridge and finding ingredients rather than anything you want to eat.
The chicken needs cooking. The vegetables need chopping. The leftovers are technically available, but you have already eaten that meal three times and cannot face it again. You close the door and decide to sort it out later.
In that situation, more ambitious meal planning may add work before it removes any. It can help to decide on one lunch you can assemble with very little preparation, using foods you already enjoy and tolerate. For example, bread with a filling you like and a piece of fruit, or a microwaveable staple with a ready-to-eat protein and vegetables. Adjust the ingredients and amount for your needs; these are examples, not a claim that any particular meal suits every person with IBS.
Include an alternative for the day your first choice is unavailable or thoroughly unappealing. A workable backup needs to be in the house, affordable and quick enough for the day you actually have.
There is no requirement for lunch to involve cooking. If the choice is between a simple assembled meal and another afternoon without food, a recipe with twelve ingredients may be solving the wrong problem.
Why missed meals deserve attention when you also have IBS
NICE guidance for IBS recommends regular meals, allowing time to eat and avoiding long gaps. This is part of first-line care, rather than a guarantee that changing your meal pattern will settle every symptom.
Suppose you miss lunch, arrive home very hungry and eat dinner quickly. Afterwards, you feel uncomfortable. It is understandable to look closely at dinner, but that one evening cannot identify a food trigger. Meal timing, portion size and pace may also be relevant to discuss.
You can read more about the wider overlap in my guide to IBS and ADHD. Having both does not establish that ADHD caused your IBS, or that remembering lunch will treat either condition on its own.
There is another possibility worth saying out loud: you remembered to eat, but were worried about the consequences. Perhaps you have a train journey, a meeting or limited access to a toilet, and eating beforehand feels risky.
If that is your situation, say so when you seek help. A reminder will not resolve the fear of urgently needing a toilet. You need a plan that takes your symptoms and the place you have to be into account. Repeatedly avoiding meals deserves attention before your food choices become narrower still.
A useful experiment for tomorrow
Choose one meal that tends to disappear. Lunch is an example, not a requirement.
Tonight, decide what the actual food will be and what would stop you eating it tomorrow. If it needs twenty minutes of cooking during a ten-minute break, change the food or the arrangement now. If you tend to stay absorbed in work, decide how you will leave a place to pick up the task again.
Afterwards, make one brief note about what happened. “Remembered at twelve, meeting ran late.” “Food ready, no appetite.” “Ate after finishing the call.” Keep it brief and record what actually got in the way.
Repeat the arrangement over a few ordinary days and adjust it. The first question is whether it helps you eat. Any change in IBS symptoms needs more cautious interpretation: a good afternoon does not prove the cause, and a difficult one does not make the experiment pointless.
If tracking food makes you anxious or more restrictive, stop and discuss a different approach with a qualified professional.
When to get help
Seek advice if you regularly struggle to eat enough, are losing weight without intending to, or are avoiding an increasing number of foods. New or persistent digestive symptoms need assessment rather than an assumption that they are part of ADHD or IBS.
Blood in your poo, unexplained substantial weight loss, or a hard lump or swelling in your tummy warrants urgent medical advice; in the UK, contact your GP urgently or NHS 111. The NHS IBS symptoms page explains when to seek help.
If you would like support with IBS and the practical difficulties around eating, we can look at both together. You can bring the days when lunch went missing, the foods you can manage and the advice you have already tried. Those details help us work out a realistic starting point.
Book a free 15-minute IBS Clarity Call to discuss what you are looking for and whether my one-to-one support is a suitable fit.
About the author
Aleks Jagiello is a dietitian specialising in IBS and gut health, with a particular interest in supporting adults with IBS and ADHD. She offers online consultations focused on practical, personalised support. Read her BDA freelance dietitian profile.
This article provides general information and does not replace individual medical or dietetic advice.
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