Food for Thought: The Nutrients Behind Memory and Focus

Nutrition | What the Body is Built on

Lemon Chicken and Bean Supper

Food for Thought: The Nutrients Behind Memory and Focus

Exploring the relationship between nourishment, blood sugar, the nervous system, and our ability to think and remember.*

Our brains are among the most energy-demanding organs in our bodies. Although the adult brain represents only about two percent of our body weight, it accounts for approximately twenty percent of the energy our bodies use at rest. Every moment, nerve cells are communicating, processing information, coordinating activity throughout the body, and participating in the remarkable processes that allow us to think, learn, concentrate, and remember. All of this activity requires energy, nutrients, oxygen, and an internal environment capable of supporting the work being done.

Yet how often do we consider nutrition when we experience difficulty concentrating, become mentally exhausted halfway through the afternoon, or find ourselves struggling to remember information that once seemed effortless? Many of us carry a persistent feeling that we could be functioning better. We may feel tired despite having slept, find ourselves becoming distracted, experience brain fog, or notice that our energy doesn't last as long as we would like. Sometimes these experiences are associated with stress, physical discomfort, interrupted sleep, or the many demands we place upon ourselves.

Our bodies communicate with us through these experiences. Although fatigue and mental fog can have many different causes, the way we nourish ourselves is one important area worth exploring.

The Promise of More Energy, Better Focus, and Sharper Thinking

Marketers understand how appealing the promise of improved performance can be. Walk through the beverage section of a grocery store, browse an online supplement shop, or look at products advertised to students and working professionals, and you'll find an increasing number promising mental energy, focus, alertness, and improved productivity. Many contain combinations of caffeine, L-theanine, B vitamins, and other ingredients associated with nervous-system function. Their packaging often suggests that greater mental performance can be achieved through a convenient drink or formulated product.

Some of these ingredients have useful properties. Caffeine, for example, can temporarily improve wakefulness and alertness by interfering with the action of adenosine, a chemical involved in the body's regulation of sleepiness. L-theanine, an amino acid naturally present in tea, has also attracted interest for its relationship with attention and relaxation, particularly when combined with caffeine. But temporary stimulation is not the same as providing the body with the nourishment required to maintain its many functions.

A highly caffeinated beverage may help someone feel more awake for a period of time, but it doesn't necessarily address why that person was exhausted in the first place. As the stimulating effects diminish, underlying tiredness may become apparent again. For some people, repeated caffeine use, particularly later in the day, can also interfere with sleep, creating another reason to reach for stimulation the following morning. Sweetened beverages can introduce another consideration. Drinks containing substantial amounts of rapidly absorbed sugar may produce a pronounced rise in blood glucose, followed by a decline as the body regulates it. The degree of fluctuation varies considerably between individuals and circumstances, but these changes can influence how some people feel.

There's nothing inherently wrong with enjoying a cup of coffee or tea. Both have been part of daily life and social traditions for generations. The more useful question is what we're asking that cup to accomplish. If we repeatedly need something to push us through the afternoon, it may be worth examining whether our sleep, meals, hydration, stress levels, and overall nourishment are supporting the demands we place upon ourselves.

The Brain's Relationship with Blood Sugar

Glucose is a major source of energy for the brain under ordinary circumstances, and our bodies have sophisticated systems for maintaining its availability. When we eat carbohydrates, digestion breaks many of them down into sugars that enter the bloodstream. Insulin helps regulate how glucose is taken up and used by various tissues, while the liver plays an important role in storing and releasing glucose between meals. The brain's energy supply is carefully regulated, and it doesn't require us to eat sugar continually. During longer periods without food, the body can draw upon stored resources, produce glucose, and, under certain conditions, supply ketones as an alternative fuel.

However, the quality of our eating pattern and our ability to regulate blood sugar matter enormously to whole-body health. A meal consisting primarily of refined carbohydrates may produce a different glucose response from one that includes fibre-rich vegetables, protein, and nourishing fats. The combination of foods influences digestion, how quickly nutrients become available, and how satisfied we feel afterward.

Over time, impaired blood sugar regulation, insulin resistance, and type 2 diabetes are associated with changes in cardiovascular and metabolic health, including an increased risk of cognitive decline. Researchers are also investigating how insulin signalling within the brain may influence nerve-cell function and the processes involved in memory. This provides another reason to care about blood sugar balance beyond the immediate concerns of diabetes. Supporting healthy metabolism also helps maintain the circulation, energy regulation, and physiological environment upon which the nervous system depends.

For everyday eating, that may mean including a meaningful source of protein with our meals, choosing vegetables and other fibre-rich foods regularly, and becoming more aware of how often highly refined foods and sweetened drinks are replacing substantial nourishment.

B Vitamins — Supporting the Work of the Nervous System

B vitamins have often been described as the stress vitamins, and there is a good reason they have become closely associated with nervous-system health. They participate in many of the biochemical processes that allow the body to produce energy from food, maintain healthy nerve tissue, synthesize important compounds, and support communication throughout the nervous system.

Vitamin B1, or thiamine, is essential to carbohydrate metabolism and helps nerve cells access the energy required for normal functioning. The brain's considerable energy demands make this especially important. Vitamin B6 participates in the formation of neurotransmitters, including serotonin, dopamine, and GABA, which have roles in mood, motivation, nervous-system activity, and communication between nerve cells.

Folate, or vitamin B9, is involved in the formation and maintenance of cells and in biochemical processes associated with nervous-system function. Vitamin B12 is particularly important for maintaining myelin, the protective covering surrounding many nerve fibres, and for normal neurological functioning. When these nutrients are inadequate, the effects may reach well beyond general tiredness. Depending on the deficiency, neurological and cognitive difficulties may also develop.

These vitamins work as part of an interconnected nutritional system. They don't replace the body's natural responses to stress, but adequate B-vitamin nutrition helps support the nervous system that must continually respond, recover, and adapt to the demands of daily life.

Whole foods offer a variety of these nutrients. Legumes, leafy vegetables, whole grains, meat, fish, eggs, and dairy products all contribute different B vitamins to our diets. Vitamin B12 is naturally found primarily in animal-derived foods, making its availability an important consideration for people who eat little or no animal food. Rather than concentrating on one isolated vitamin, we can consider whether the overall variety and quality of our food is supplying the range of nutrients our nervous system requires.

Omega-3 Fatty Acids — Part of the Brain's Physical Structure

When we think about feeding our brains, fats deserve a prominent place in the conversation. The brain contains substantial amounts of lipids, many of which form essential parts of cell membranes, myelin, and other structures involved in nervous-system function.

DHA, a long-chain omega-3 fatty acid, is particularly important in the membranes of nerve cells. These membranes are not passive coverings; they are involved in the organization and functioning of the proteins and signalling systems through which cells communicate. EPA, another long-chain omega-3 fatty acid, participates in the production of compounds involved in regulating inflammatory processes and other physiological activities.

Together, EPA and DHA are important components of nutritional health, and researchers continue exploring their relationships with mood, cognition, and healthy aging. Fatty fish such as sardines, herring, mackerel, and salmon are among the better dietary sources of EPA and DHA. Certain algae-derived oils provide another source, particularly for people who avoid fish.

When choosing an omega-3 supplement, quality matters. A well-made product should clearly identify its EPA and DHA content, be protected from unnecessary oxidation, and ideally provide independent quality testing for freshness and contaminants. The amount of oil listed on the front of a bottle doesn't necessarily tell us how much EPA and DHA it contains.

It's also worth remembering that food and supplements serve different purposes. Including suitable sources of nourishing fats in everyday meals provides a broader nutritional foundation, while supplementation may help address particular needs.

Choline — A Nutrient Worth Remembering

Choline receives considerably less attention than many vitamins, yet it plays important roles throughout the body and nervous system. It is required to produce acetylcholine, a neurotransmitter involved in attention, learning, memory, and muscle control. Choline also contributes to the formation of phospholipids, important structural components of cell membranes, and supports normal fat metabolism in the liver.

Eggs are one of the most familiar and useful dietary sources of choline, particularly the yolks. For many years, eggs were frequently discussed almost exclusively in relation to cholesterol, while their broader nutritional contribution received less attention. A wholesome egg provides protein, choline, and several other nutrients that contribute to our nutritional needs. Other sources of choline include fish, poultry, meat, soybeans, and certain vegetables.

Choline offers a particularly good example of how nourishment supports memory. We aren't merely feeding the brain calories; we're supplying some of the raw materials required to construct cells and produce the chemical messengers through which the nervous system communicates.

The Many Colours of Brain Nutrition

Colourful plant foods contribute far more than visual appeal to our meals. Leafy vegetables contain nutrients such as folate and carotenoids. Berries contain naturally occurring polyphenols, including anthocyanins, which are being investigated for their relationship with vascular health, inflammation, and cognitive function. Other vegetables, fruits, herbs, and legumes provide a wide range of vitamins, minerals, fibre, and protective plant compounds.

These foods support multiple systems at once, including cardiovascular, digestive, and metabolic health. A plate containing dark leafy greens, brightly coloured vegetables, a substantial protein source, and nourishing fats provides many different nutrients participating in different processes throughout the body.

There is no requirement to buy exotic berries or expensive powders to achieve that variety. Cabbage, carrots, kale, beets, broccoli, apples, frozen berries, and other familiar foods can all contribute meaningfully. The larger nutritional pattern matters far more than making any one ingredient responsible for maintaining our memory.

The Gut and Brain — A Continuing Conversation

Our digestive system and brain are in constant communication through neural, hormonal, immune, and metabolic pathways. The gut contains an extensive nervous system of its own, while the microorganisms living throughout the digestive tract interact with the food we consume and produce substances that can influence the body's internal environment.

The gut microbiome has become an important area of research because of its relationships with digestion, immune function, metabolic processes, and communication along what is commonly called the gut-brain axis. There are also protective barriers involved in this relationship.

The intestinal lining regulates the movement of nutrients and other substances from the digestive tract into the body. When intestinal permeability becomes altered, the barrier may allow substances to cross differently from what would ordinarily occur. This is sometimes described in functional wellness discussions as leaky gut.

The brain has its own specialized protective system, known as the blood-brain barrier, which carefully regulates what moves from the bloodstream into brain tissue. Changes in the function of this barrier are being studied in relation to inflammation and neurological conditions, sometimes leading to the informal expression leaky brain.

These are distinct protective systems, and changes in one do not automatically establish changes in the other. Nevertheless, research into the communication among the microbiome, intestinal barrier, immune system, metabolism, and brain is giving us a deeper appreciation of how closely different parts of the body influence one another.

This is another reason to nourish the digestive system with varied plant foods, adequate fibre, and foods that support healthy metabolic and digestive function. The body does not operate as a collection of unrelated organs. The conditions in which one system functions can influence the work of many others.

Building a Foundation for Lifelong Brain Health

Two eating patterns frequently discussed in relation to cognitive health are the Mediterranean diet and the MIND diet. Both emphasize foods such as vegetables, leafy greens, legumes, whole grains, berries, fish, and unsaturated fats. The MIND diet was specifically developed to examine dietary patterns associated with cognitive aging and brain health.

Research continues to investigate their long-term effects, but their broader nutritional value is easy to appreciate. They encourage diversity, substantial nourishment, and regular inclusion of foods associated with cardiovascular and metabolic health. These ideas don't need to become rigid rules. They can provide inspiration for meals built around familiar ingredients, seasonal availability, and personal preferences.

And nourishment involves more than selecting nutritious ingredients. It also involves ensuring we're eating enough to meet our needs, giving ourselves opportunities to eat rather than continually pushing through hunger, and recognizing when our everyday routine may be leaving us short of the energy and nutrients required for healthy functioning.

A busy schedule can make it easy to postpone meals, rely on convenience foods, or use caffeine to bridge the gaps. Occasionally this may be unavoidable, but when it becomes our usual pattern, it is worth asking whether we are providing our bodies with what they need to manage the demands we're placing upon them.

Bringing Nourishment Back to the Table

Our bodies are continuously communicating with us through sensations, energy levels, appetite, digestion, concentration, sleep, and countless other experiences. These signals don't always tell us precisely what is happening. Mental fatigue, for example, can arise from many causes beyond nutrition. But they give us an opportunity to become curious about our habits and consider where improvements may be possible.

If your concentration regularly disappears halfway through the day, you might begin by looking at what you've eaten, whether you've had enough fluids, how you've slept, and what demands you've been managing. If you're repeatedly reaching for something to stimulate your energy, consider whether there is something in your daily routine that would benefit from more consistent nourishment or a different pace.

And when you prepare your next meal, think about the remarkable work your brain is doing on your behalf. The protein, vitamins, minerals, fatty acids, fibre, and colourful plant compounds you provide are all participating in the much larger process of maintaining a healthy body.

The most valuable nutritional changes are often those we can continue making through ordinary daily living, using foods that are enjoyable, accessible, and suited to our individual needs. Our brains will continue working for us throughout our lives. Providing them with good nourishment is one meaningful way we can support that work.

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From the Casaroma Kitchen

Mediterranean Lemon Chicken with White Beans & Garden Greens

A colourful, satisfying meal bringing together protein, fibre, nourishing fats, vegetables, and herbs.

Serves 4

Ingredients

- 4 boneless chicken breasts or thighs

- 2 cups cooked white beans, rinsed and drained

- 3 cups chopped kale or Swiss chard

- 1 red bell pepper, sliced

- 1 small red onion, cut into wedges

- 2 cloves garlic, minced

- 2 tablespoons extra-virgin olive oil

- Juice and zest of 1 lemon

- 1 teaspoon dried oregano

- 1 teaspoon dried thyme

- Fresh parsley

- Sea salt and black pepper to taste

- ½ cup chicken broth

Preparation

Preheat the oven to 400°F (200°C). Arrange the chicken, red pepper, and onion in a baking dish. Combine the olive oil, lemon zest, half the lemon juice, garlic, oregano, thyme, salt, and pepper, and distribute over the chicken and vegetables.

Roast for approximately 20 minutes, depending on the thickness of the chicken. Add the drained white beans and broth around the chicken, then return the dish to the oven until the chicken reaches an internal temperature of 165°F (74°C).

During the last few minutes, fold the kale or Swiss chard into the hot beans and broth so the greens soften without becoming overcooked.

Finish with the remaining lemon juice and fresh parsley. Serve the chicken over a generous helping of the beans and vegetables, spooning the lemon-herb juices over everything.

What this meal provides: Chicken contributes protein and B vitamins; white beans provide fibre, folate, and other minerals; leafy greens contribute folate and protective plant compounds; and olive oil supplies predominantly monounsaturated fat. Together, they create a satisfying meal that supports nourishment throughout the body.

Casaroma Wellness — Whole Food. Whole Person. Whole Life.