Journal #35. The truth about processed food, sugar and cognitive performance.
The truth about processed food, sugar and cognitive performance
Convenience foods are part of modern life. A packaged snack, takeaway meal or busy-week shortcut does not determine your health.
The issue is the overall pattern.
When ultra-processed foods make up a large share of your diet, they can crowd out the foods that provide fibre, protein, healthy fats, vitamins, minerals and plant compounds that support the brain and body over time.
Your brain is energy-intensive. It relies on a steady supply of nutrients, good circulation, quality sleep and healthy metabolic function to support attention, memory, mood and decision-making.
What you eat is one part of that picture.
What are ultra-processed foods?
Ultra-processed foods are industrially formulated products that often contain refined ingredients, additives, flavourings, emulsifiers, sweeteners or preservatives. They are typically designed to be convenient, highly palatable and easy to eat quickly.
Examples can include sugary drinks, confectionery, packaged biscuits, many breakfast cereals, instant noodles, processed meats, some ready meals and snack foods.
Not every packaged food is ultra-processed, and not every processed food is a poor choice. Tinned beans, frozen vegetables, plain yoghurt, wholegrain bread and canned fish can all be practical parts of a nutritious diet.
The goal is not perfection. It is to make whole and minimally processed foods the default more often.
What the research suggests
Observational studies have found an association between higher intake of ultra-processed foods and poorer health outcomes, including cardiovascular and metabolic health. Some research has also linked high ultra-processed-food intake with faster cognitive decline.
One widely reported study following adults over several years found that people with the highest intake of ultra-processed foods experienced faster decline on some cognitive measures. That does not prove ultra-processed foods directly caused the decline. Diet is connected with many other factors, including income, stress, sleep, activity levels, smoking, education and overall health.
Still, the broader message is useful: dietary patterns matter for long-term brain health.
How a highly processed diet may affect the brain
Researchers are exploring several possible pathways.
Less nutritional value per meal
Highly processed foods can displace nutrient-rich foods such as fruit, vegetables, legumes, whole grains, nuts, seeds, fish and quality protein. Over time, this can mean less fibre, fewer micronutrients and fewer beneficial plant compounds in the diet.
Blood-sugar swings and energy crashes
Foods high in refined carbohydrates and added sugars can contribute to rapid rises and falls in blood sugar for some people. That can leave you feeling hungry again quickly and may contribute to energy dips or difficulty concentrating.
Cardiovascular and metabolic health
The brain depends on healthy blood vessels and circulation. Dietary patterns that support heart and metabolic health are also important for long-term cognitive health.
The wider lifestyle pattern
A diet high in ultra-processed foods may also reflect a busy, stressed routine with less sleep, less movement and fewer regular meals. That does not make it a personal failure. It is a reminder that brain health is shaped by the full pattern of everyday life.
Practical ways to reduce ultra-processed foods
You do not need to overhaul your kitchen overnight. Start with one or two easy swaps.
- Choose porridge, eggs or plain yoghurt with fruit instead of highly sweetened breakfast options.
- Keep fruit, nuts, hummus, boiled eggs or cheese available for quick snacks.
- Use frozen vegetables, tinned beans, canned fish and pre-cooked grains to make meals easier.
- Batch-cook one or two meals each week so convenience does not always mean takeaway.
- Check sauces, drinks and snack foods for added sugar rather than assuming they are harmless.
- Build meals around protein, fibre and colourful plants to support steadier energy.
- Aim for progress, not restriction. A diet you can sustain is more valuable than a short-lived reset.
Where Brain Health fits
Food should always come first.
For people looking for additional support, Brain Health was developed by Natural Medicine Neuroscientist Megan Wilks and has been trusted by practitioners since 2015.
Its botanical formulation includes selected flavonoid-rich extracts from German chamomile, citrus and cacao. It is designed to support cognitive function, mental clarity, healthy mood balance and everyday brain resilience.
Brain Health is intended to complement a varied, nutrient-rich diet and healthy lifestyle habits. It is not intended to offset the effects of a poor diet, diagnose or treat neuroinflammation, or prevent or treat cognitive decline, depression, anxiety or other medical conditions.
Your brain is shaped by everyday choices
Your brain is not passively ageing. It is continually responding to sleep, movement, stress, connection, recovery and the food you eat.
Small changes can add up: one more home-cooked meal, one less sugary drink, more fibre, more colourful plants and a more consistent routine.
That is how you support cognitive performance — not through perfection, but through practical choices repeated over time.
