Perimenopause and Brain Fog: How Nutrition Can Support Your Brain
Finding the right word, walking into a room and forgetting why, struggling to concentrate during a meeting or feeling mentally exhausted by the end of the day - brain fog can be a debilitating part of perimenopause.
Cognitive symptoms, including difficulties with memory, concentration and mental clarity, are commonly reported during the menopause transition. Research suggests that some women experience subtle changes in aspects of memory and cognition during perimenopause, although clincial observations demonstrate that the experience of brain fog varies considerably between individuals.
The good news is that there are practical ways to support your brain and overall well being during this stage of life, including paying attention to what you eat and when you eat it, sleep and hormones.
What causes brain fog during perimenopause?
The exact causes of menopausal brain fog are not fully understood. Fluctuating and declining oestrogen will likely play a role, but brain fog is rarely caused by one factor alone.
Poor sleep, stress, anxiety, hot flushes, fatigue and changes in lifestyle can all affect concentration and memory. Nutritional factors can also have an influence on this, especially as nutrition can be overlooked during this time of life due to the load of other responsibilities.
This is why supporting your health during perimenopause needs to be about more than simply focusing on hormones.
Can nutrition help with menopause brain fog?
There is no single food or supplement that can “cure” brain fog. However, a balanced and varied diet can provide the nutrients and energy your brain needs to function well.
Focus on regular, balanced meals
Busy lives can often led to skipping meals or going long periods without eating can leave you feeling tired, distracted and lacking in energy.
Try to build meals around a combination of:
Protein – such as eggs, fish, chicken, Greek yoghurt, tofu, beans or lentils
High-fibre carbohydrates – such as oats, wholegrains, potatoes and wholegrain bread
Healthy fats – including nuts, seeds, olive oil and oily fish
Fruit and vegetables – for a wide range of vitamins, minerals and plant compounds
Regular meals can also make it easier to maintain a consistent energy intake throughout a busy day.
Don't overlook omega-3 fats
Oily fish such as salmon, sardines, mackerel and trout provide omega-3 fatty acids, which are important components of cell membranes, including those in the brain.
Aim to include oily fish regularly as part of a balanced diet. Plant sources such as walnuts, chia seeds and flaxseeds can also contribute omega-3 fats.
Check your iron and B12 intake
Nutrients such as iron, vitamin B12 and folate are important for normal energy metabolism and neurological function. During perimenopause, heavy or prolonged periods can increase the risk of iron deficiency in some women.
If you are experiencing fatigue, poor concentration or other symptoms that concern you, it is important you discuss this with your GP who can arrange blood tests to check your nutrient stores.
Why see a dietitian for perimenopause?
Nutrition advice during menopause can sometimes feel overwhelming. There are countless online claims about “menopause diets”, supplements and foods that are supposed to balance hormones or eliminate symptoms.
A registered dietitian can help you separate evidence-based nutrition from unnecessary restriction and make recommendations that are appropriate for your individual health, symptoms and lifestyle.
A dietitian can support you to:
assess whether your current diet is meeting your nutritional needs
improve meal structure and overall dietary quality
identify potential nutritional deficiencies
support healthy ageing, muscle and bone health
manage digestive symptoms such as bloating or constipation
review your diet alongside changes in weight or appetite
make practical changes that fit around work, family and everyday life
avoid unnecessary restrictive diets and supplement use
Nutrition is only one part of managing perimenopause, and a dietitian can work alongside your GP or menopause specialist where appropriate.
Looking after your brain during midlife
Brain fog can be unsettling, but experiencing occasional memory lapses or difficulty concentrating during perimenopause does not necessarily mean that something is seriously wrong.
A balanced diet, regular physical activity, good-quality sleep and attention to stress can all form part of a healthy approach to cognitive wellbeing.
If cognitive symptoms are persistent or affecting your daily life in any way, it is important to discuss them with your GP. You do not have to live with these symptoms.
Looking after your nutrition during midlife is not about following a perfect diet. It is about giving your body and brain consistent nourishment while adapting to the changes that can come with perimenopause.
References
Maki PM, Jaff NG. Menopause and brain fog: how to counsel and treat midlife women. Menopause. 2024;31(7):647–649.
British Menopause Society. Menopausal ‘brain fog’ or dementia? – A practical guide for clinicians. 2026.
National Institute for Health and Care Excellence (NICE). Menopause: identification and management (NG23).Updated 2026.
Andy C, et al. Systematic review and meta-analysis of the effects of menopause hormone therapy on cognition.Frontiers in Endocrinology. 2024;15:1350318.