Food is Medicine: How What You Eat Shapes Your Nervous System and Long-Term Health

Rayhana Erasmus
Jun 5
11 min read

The Modern Health Crisis Nobody Is Talking About Loudly Enough

There is a quiet epidemic unfolding in our bodies. Not in hospital wards or emergency rooms, but in the everyday hum of our overscheduled, overstimulated, under-nourished lives.

We wake up exhausted.

We reach for sugar when we are tired.

We skip meals when we are anxious.

We comfort-eat when we are overwhelmed.

And most of us have never once considered that these habits might be the very fuel feeding a fire that is silently burning through our health.

That fire has a name: chronic inflammation. And it is intimately linked to something many of us have never been taught, that is, the relationship between what we eat, how our nervous system functions, and whether our bodies tip toward disease or toward healing.

During a recent session of the 6-Week Somatic Nervous System Reset program at Raydiance Wellness, registered dietitian Lebo Dioka joined us to present on using food as medicine.

What she shared was not a trendy diet or a supplement protocol. It was a lucid, science-backed, deeply practical framework for understanding how our daily food choices send powerful messages throughout our bodies - to our hormones, our immune systems, our digestive systems, and yes, to our nervous systems too.

This article is a distillation of that session, enriched with research and context, offered to you as both a wake-up call and a roadmap.

What Is Chronic Inflammation and Why Should You Care?

Let us begin by making peace with inflammation itself. Inflammation is not the enemy. When you cut your finger, or twist your ankle, or catch a cold, your body mounts an immune response. The affected area becomes red, swollen, and warm. That is acute inflammation: your body's brilliant, rapid-response healing system doing exactly what it was designed to do.

The problem arises when that same response becomes chronic when the immune system stays switched on long after there is any immediate threat. Chronic inflammation is insidious because it happens silently, inside the body, and often without obvious symptoms, until it becomes a disease.

"With chronic inflammation, that leads to disease." - Lebo Dioka, Registered Dietitian

Research confirms this directly: chronic inflammation contributes to insulin resistance, impairs glucose metabolism, and increases risk of type 2 diabetes and cardiovascular disease. Inflammation and insulin resistance often co-occur and reinforce each other in a vicious cycle. The conditions that emerge from this cycle are ones many of us know personally: polycystic ovarian syndrome (PCOS), arthritis, hypertension, metabolic syndrome, heart disease, and type 2 diabetes.

What triggers chronic inflammation? The list is sobering:

Chronic psychological stress
A sedentary lifestyle
Food allergies and intolerances
Gum disease
Environmental toxins
Ultra-processed foods and trans fats
Excess sugar — one of the most powerful drivers of all

The encouraging truth? Many of these triggers are within our sphere of influence. And diet, as Lebo powerfully demonstrated, is one of the most immediate levers we can pull.

The Sugar and Insulin Resistance Epidemic

Here is a number that should stop you mid-sip of your next cold drink: the average South African consumes between 12 to 24 teaspoons of sugar per day. To put that in a broader context, South Africa's per-capita annual sugar consumption was approximately 36 kg in 2013, ranking the country seventh globally, and sales of sugar-sweetened beverages doubled from 3 to 6 billion litres between 2002 and 2016.

We are, quite literally, drowning in sugar. And our bodies are paying the price.

To understand why, Lebo offered an elegant analogy. Imagine insulin as a key, and the insulin receptor on each cell as a keyhole. When the key turns correctly, it allows glucose or sugar to move from the bloodstream into the cells, where it is used as energy. The system works beautifully when blood sugar levels are balanced.

Now imagine flooding that system with far more sugar than it can handle. Using a quintessentially South African metaphor, Lebo described it like this: picture the glucose as taxi passengers, and the insulin receptors as the taxis themselves. When there are more passengers than taxis can carry, chaos ensues. Sugar overflows in the bloodstream. The body, desperate to cope, begins storing the excess as fat. Over time, the insulin receptors become less responsive, overwhelmed, overworked, and increasingly resistant. This is insulin resistance.

What happens next? The pancreas produces even more insulin to compensate. Blood glucose remains elevated. Fat accumulates, particularly around vital organs. And the cascade continues, toward pre-diabetes, type 2 diabetes, hypertension, and metabolic syndrome. Type 2 diabetes prevalence among South Africans aged 25 and older currently sits at approximately 15.3%.

The single most impactful dietary change you can make? Reduce your sugar intake. As Lebo put it: "If you forget everything here and remember just one thing, reducing sugar would be it."

Ultra-Processed Foods: The Silent Disruptor

We cannot talk about sugar without talking about the delivery system that sneaks it into our lives in disguise: ultra-processed foods (UPFs).

Lebo was careful to draw a useful distinction here. All food is processed to some degree; chopping an apple is processing; baking bread from whole grain flour is processing. That is not the concern. The concern is ultra-processed food: products manufactured with industrial techniques, packed with artificial ingredients, colourings, preservatives, trans fats, excess sodium, and hidden sugars, foods whose true ingredients are unrecognisable without reading a label.

What makes UPFs particularly dangerous is not just what they contain, but what they do to us psychologically. Food scientists are literally hired to engineer these products to be as craveable as possible, to override our natural satiety signals and make whole, natural foods seem bland by comparison. Think about the genius of "snap, crackle, and pop." Think about the psssht of a Coke can opening, designed to make your mouth water. Think of the satisfying crunch of a packet of chips. None of this is accidental.

"In a lot of ways, it really is not our fault. It's the environment, it's the marketing, it's the mass production of food." - Lebo Dioka

But the consequences extend well beyond our waistlines. Research shows that UPF intake is associated with increased risks of depression, anxiety, cognitive decline, dementia, and stroke. The mechanisms are now better understood: rapid sugar spikes, additives that disrupt gut microbiota, leaky gut, neuroinflammation, and altered reward signalling in the brain. In short, ultra-processed foods do not just harm the body; they harm the brain and the nervous system, too.

When we displace whole foods with UPFs, we also lose the fibre, vitamins, and antioxidants our bodies depend on for repair, immunity, and metabolic health. The solution is not perfection. It is an intention. It is learning to identify real food, the kind that doesn't need a marketing message to explain what it is.

Eating to Heal: Practical Nutritional Principles

This is where the session truly came alive in the practical, accessible, real-world guidance that Lebo offered. Not a rigid meal plan. Not a list of forbidden foods. But a framework for nourishment that is flexible, culturally sensitive, and deeply effective.

The Healthy Plate Model

The most visual tool Lebo offered was the healthy plate model. A simple framework aligned with guidelines from the Heart Foundation of South Africa and ADSA:

Crucially, Lebo showed examples of this model across different budgets, including a plate of pap and meat. Because health is not a privilege. The principles remain the same regardless of your income: protein + vegetables + a modest portion of starch + a healthy fat. The rest is flexibility.

Whole Grains vs. Refined Carbohydrates

Refined carbohydrates like white bread, white rice, pastries, chips, juice, and sweets have had their outer grain layer stripped away. That stripping removes not just fibre but critical nutrients. What remains is rapidly digested, sending blood glucose and insulin levels spiking sharply.

Whole grains, by contrast, retain their fibre and phytonutrients. They digest more slowly, releasing glucose gradually into the bloodstream and keeping insulin levels stable. They also support gut health, which in turn benefits the nervous system and immune function. The shift from refined to whole grain carbohydrates is one of the most impactful and sustainable dietary changes you can make.

A note on portion sizes: even whole grains convert to glucose eventually. Six slices of whole-grain bread will still flood your bloodstream with sugar, just more slowly. Mindful portions matter.

Omega-3s and Anti-Inflammatory Fats

Of all the nutrients discussed, omega-3 fatty acids earned special attention, and for good reason. These polyunsaturated fats are directly anti-inflammatory: they reduce neuroinflammation via specialised pro-resolving mediators called resolvins, protectins, and maresins, protect neurons, and support nervous system recovery. Omega-3 supplementation has even been shown to improve neural processing speed and efficiency in humans.

There are three main types: ALA (found in plants), and EPA and DHA (found primarily in marine sources). While ALA is available from plant sources like chia seeds, walnuts, flaxseed, and Brussels sprouts, EPA and DHA from fatty fish are the most bioavailable and potent anti-inflammatory forms.

Lebo's recommendation: eat fish at least twice a week. And it doesn't have to be expensive. Sardines, mackerel, and pilchards (yes, even Lucky Star!) are all excellent, affordable sources. For vegans and vegetarians, algae-based omega-3 supplements offer EPA and DHA directly, bypassing the ALA conversion entirely.

On salmon: A question arose in the session about farmed salmon and mercury concerns. Lebo's guidance: If you can access and afford quality salmon, it remains a healthy choice. Alternatively, source fresh fish from trusted local fishmongers in your community. 🐟

Protein for Muscle and Metabolic Health

Protein is not just for gym-goers. It is fundamental to maintaining muscle mass, stabilising blood sugar, regulating appetite, and supporting immune function. And most people, particularly women over 40, are not eating nearly enough of it.

Lebo's guidelines are clear:

To maintain muscle mass: 0.8 g of protein per kilogram of body weight per day
To build muscle mass: 1.2–1.6 g per kilogram of body weight per day, combined with resistance training

What does this look like in practice? For a woman weighing 65 kg who wants to maintain her muscle mass, that is approximately 52 g of protein per day. For building muscle, she would need between 78–104 g. Most people are shocked to discover how far short they fall. Tools like the Fat Secret app make it easy to track this.

Lebo also made an important point about body composition. A person can appear slim and register a "healthy" BMI while actually carrying high body fat and dangerously low muscle mass. Conversely, someone who appears "overweight" by the scale may have high muscle mass and excellent metabolic health. Weight is not the whole story.

Colourful Phytonutrients

Eat the rainbow, and mean it. Colourful fruits and vegetables deliver not just vitamins and minerals but phytonutrients: plant compounds with powerful anti-inflammatory, antioxidant, and immune-supporting properties. Different colours signal different phytonutrient profiles: deep greens, vibrant reds, purples, oranges, and yellows each bring their own unique nutritional gifts.

Lebo's advice: aim for at least three portions of vegetables and two portions of fruit per day, with as much variety and colour as possible. Go easy on high-sugar fruits like bananas (which can contain up to 5–7 teaspoons of sugar each) when making smoothies, and lean toward lower-sugar options like berries, kiwi, and guava instead.

The Mind-Body Connection: Nutrition and Somatic Healing

Here is something that most nutrition articles will not tell you: what you eat between your healing sessions matters just as much as the sessions themselves.

At Raydiance Wellness, TRE (Tension and Trauma Releasing Exercises) forms the core foundation of our somatic healing work. Developed by Dr. David Berceli, TRE is a body-based method that uses gentle movements to activate involuntary neurogenic tremors, the body's innate mechanism for releasing deep muscular tension and calming an overstimulated nervous system. It works through the body rather than the mind, helping to complete the natural stress-release cycle that modern life so often interrupts.

But the body that shows up to each TRE session is shaped by everything that has happened between sessions. And food is one of the most powerful shapers of that body.

When the nervous system is under prolonged stress, our nutritional needs shift. Stress influences digestion, blood sugar regulation, inflammation levels, sleep quality, energy, cravings, and our ability to absorb nutrients. A body running on refined carbohydrates, hidden sugars, and ultra-processed foods is a body in a state of metabolic stress, producing more cortisol, more insulin, more inflammation. It is a nervous system that cannot easily settle.

Contrast that with a body nourished by whole foods, adequate protein, anti-inflammatory omega-3s, and a rainbow of phytonutrients. This body has the raw materials it needs to repair, to regulate, and to recover. The tremors of TRE have a richer, more receptive terrain to work with.

Anti-inflammatory dietary patterns, combining omega-3s, whole grains, fruits, vegetables, and phytochemicals (as in the Mediterranean or MIND diets), are linked not only to lower inflammation but to better brain health outcomes overall. Healing is not siloed. It is a whole-system endeavour.

Where to Start: Actionable Steps

You do not need to overhaul your entire life by Monday. Start with one thing. Then another. Progress, not perfection, is the path.

Immediate Actions

Audit your sugar: Start reading labels. Look for hidden sugars in sauces, cereals, "health" bars, and drinks. Aim to crowd them out with real food.
Build your plate: Use the healthy plate model as your guide, half vegetables, a quarter protein, a quarter (or less) whole grain starch, and a healthy fat.
Add fish twice a week: Sardines, mackerel, salmon, or pilchards. Anti-inflammatory power on a budget.
Eat more colour: Aim for at least three vegetables and two fruits daily. Variety is the goal.
Prioritise protein: Calculate your baseline protein requirement and see how close you actually come. You may be surprised.
Choose whole over refined: Brown rice over white. Whole-grain bread over white. Oats over instant cereals.

Helpful Tools

Fat Secret app: A free, easy-to-use nutrition tracking tool. Log your meals, set your goals, and watch the patterns emerge. Use it as a mirror, not a punisher.
ADSA (Association for Dietetics in South Africa): Visit www.adsa.org.za to find a registered dietitian in your city. Consultations can be done online. This is regulated, professional, personalised guidance, worth every cent.
Dr. Angelique Oliveira: A functional medicine doctor who takes a holistic approach to health, integrating medicine, nutrition, and overall wellness.

A Note on Registered Dietitians vs. Nutritionists

This distinction matters. A registered dietitian has completed a four-year degree, an internship, and is registered with a regulated health professional board. The title "nutritionist," by contrast, is not legally protected in South Africa, meaning anyone can claim it after a short course. When your health is at stake, especially if you are navigating hormonal shifts, inflammatory conditions, or metabolic concerns, seek out a regulated, board-registered professional. You would not hire an unregulated lawyer. Apply the same standard to your health.

A Call to Reclaim Your Health Through Intentional Eating

We began this article by naming the quiet epidemic of our age. Let us close it with something louder: hope.

The science is clear, the tools are accessible, and the wisdom has been shared. You do not need a complete life transformation or an expensive supplement stack. You need knowledge, intention, and a willingness to begin.

Food is not just fuel. It is information. Every meal you eat sends a message to your immune system, your hormones, your brain, and your nervous system. The question is not whether you are sending messages; you are, three times a day or more. The question is: what are you saying?

In the words that opened our water-themed meditation that evening: water does not force its way. It flows. It softens. It finds its way around obstacles. Your healing journey can be like that too, not a battle of restriction and willpower, but a gentle, consistent, compassionate flow toward nourishment.

Start where you are. Use what you have. And remember: every single whole, colourful, intentional meal is an act of care for your nervous system, your body, and your future self.

About Raydiance Wellness: The 6-Week Somatic Nervous System Reset program combines TRE (Tension and Trauma Releasing Exercises), guided meditation, elemental somatic practices, and expert guest sessions to support whole-body healing. To learn more or join the next cohort, reach out to Rayhana Erasmus at Raydiance Wellness Studio on +2772 091 3563 or raydiancews@gmail.com

This article is based on content shared during the Raydiance Wellness 6-Week Somatic Nervous System Reset program, Week 3 session, featuring registered dietitian Lebo Dioka. It is intended for educational purposes and does not constitute personalised medical or nutritional advice. Please consult a registered healthcare professional for guidance specific to your needs.