Nutrition is fundamental to human performance. It influences energy, concentration, resilience, recovery and long-term health, providing the biological foundation upon which human capability depends. While much attention is given to what we should eat, far less consideration is given to where the nutritional quality of food actually begins.

Nutrition  begins much earlier than in the supermarket or the kitchen.  It is the biological environment in which plants grow, the health of soils, microorganisms, biodiversity and agricultural systems all influence the nutrients and thousands of other compounds that plants produce.

This article traces the journey of nutrition backwards from human performance to food, agriculture and ecosystems, to explore why understanding where nutrition begins provides a broader perspective on sustaining health and performance.

Nutrition Supports Human Performance

Whether we are leading a business, studying for an exam, raising a family or training for a marathon, our ability to perform depends upon the body functioning well. Every thought we have, every decision we make and every movement we perform relies upon billions of cells working together in remarkable coordination. Nutrition provides the biological building blocks that make this possible.

Carbohydrates, fats and proteins supply energy and structural components, they are  macro-nutrients. Vitamins and minerals enable thousands of biochemical reactions to occur every second, they are micronutrients. Phytonutrients and other naturally occurring plant compounds continue to be investigated for their potential roles in supporting normal physiological function. Together, these three types of nutrients help maintain energy production, immune function, recovery, cognition and countless other processes that contribute to human performance. Good nutrition is therefore about more than avoiding deficiency. It is about creating the conditions in which the body can function at its best.

Over recent decades, nutritional advice has increasingly encouraged us to consider what we eat. We compare dietary patterns, read nutrition labels and pay greater attention to calories, protein, vitamins and minerals. Yet one important question is rarely asked. Where does the nutritional quality of our food actually come from? To answer that question, we need to follow the journey of nutrition backwards.

Human performance depends on nutrition. Understanding nutrition begins by understanding where the quality of our food comes from.

When we compare foods, calories often dominate the conversation. They provide a useful measure of the energy contained within food and remain an important part of nutritional science. However, calories tell us very little about the biological richness of food.Nutrition labels typically list energy, protein, fat, carbohydrates and selected vitamins and minerals. While valuable, these represent only a fraction of what whole foods naturally contain. Plants produce an extraordinary diversity of compounds throughout their lives. Beyond vitamins and minerals, fruits, vegetables, herbs, legumes and grains contain fibre together with thousands of naturally occurring phytochemicals, including polyphenols, flavonoids, carotenoids and many other compounds that contribute to their colour, flavour, aroma and biological activity. Many of these are now being studied for their potential roles in supporting human health. This means two foods containing similar calories can differ considerably in their nutritional value.

Likewise, two tomatoes of the same variety may not contain exactly the same nutrients. One may have developed under conditions that encouraged the production of a wider range of vitamins, minerals and phytochemicals than another. The same can be true for apples, carrots, lettuce or almost any crop we eat. Food, therefore, is not simply a collection of calories. It is the product of countless biological processes that occur while a plant is growing. 

Calories measure energy. They do not measure the biological richness of food.

An increasing body of research suggests that, in many cases, degradation of the environment  has led to a decrease in human nutrition. One of the most frequently cited studies was published in 2004 by Donald Davis and colleagues at the University of Texas. By comparing nutrient data for 43 garden crops between 1950 and 1999, the researchers found significant declines in several nutrients, including protein, calcium, phosphorus, iron, riboflavin and vitamin C. While the changes varied between crops, the study suggested that modern varieties bred for higher yields may contain lower concentrations of some nutrients through what has become known as the dilution effect.

Since then, other studies have reported similar concerns. Research has documented declines in certain minerals, while rising atmospheric carbon dioxide has been shown to reduce the concentration of protein and key micronutrients such as zinc and iron in several staple crops. At the same time, researchers continue to investigate how modern production systems influence the thousands of phytochemicals that contribute to the biological complexity of food.

Many traditional diets contained a far greater diversity of plant species than those consumed today. Modern agriculture has focused on a relatively small number of high-yield crops, while highly processed foods now account for an increasing proportion of dietary intake in many countries. As dietary diversity has declined, so too has our exposure to the wide range of naturally occurring compounds found in whole foods.

Alongside these nutritional changes, increasing attention has been given to pesticide exposure. Today, around 3.5 million tonnes of pesticides are applied to crops worldwide each year. Although these products help protect crops from weeds, insects and disease, residues can remain on food, while rainfall can carry pesticides and water soluble fertilizers into rivers, lakes and groundwater, affecting surrounding ecosystems.

Food has changed. Understanding why requires us to look beyond nutrition and examine the agricultural systems in which our food is produced.

The evidence suggests that the nutritional quality of some foods has changed. To understand why, we need to look beyond the plant itself and examine the environment in which it grows. Agriculture has transformed the environment in which crops develop. Today, around 50% of the world’s habitable land is used for agriculture, approximately 70% of global freshwater withdrawals support agricultural production, and around 3.5 million tonnes of pesticides are legally applied worldwide each year. This is 1400 olympic size swimming pools. Large monocultures, synthetic fertilisers, herbicides, fungicides and pesticides have become common features of many farming systems.

These practices have greatly improved productivity, but they have also contributed to soil degradation, biodiversity loss, nutrient runoff into rivers and lakes, and increasing dependence on external inputs. 

Because plants continuously respond to the conditions around them, changes in the growing environment can influence not only crop yields but also the nutritional composition and biological complexity of the food they produce. There are other systems of agriculture which improve nutrient content and reduce potential toxicity content:

Organic Agriculture

Organic agriculture seeks to produce food while reducing reliance on synthetic fertilisers and pesticides. It places greater emphasis on crop rotation, composting, natural fertility, soil health and biodiversity. By supporting the biological processes within the soil, organic farming aims to create healthier growing conditions for plants.

Biodynamic Agriculture

Biodynamic agriculture builds on many organic principles but views the farm as an integrated living system. It emphasises soil vitality, composting, crop diversity and long-term ecological balance. While some aspects of biodynamics remain outside mainstream scientific evaluation, many of its practical farming methods align with approaches that strengthen ecological function.

Regenerative Agriculture

Regenerative agriculture focuses on restoring ecological function rather than simply sustaining production. Practices commonly include increasing soil organic matter, minimising soil disturbance, maintaining living roots, improving biodiversity, integrating livestock where appropriate and enhancing water retention. The objective is to rebuild the natural processes that support resilient and productive agricultural systems.

Agroecology

Agroecology applies ecological science to agriculture. Rather than viewing crops in isolation, it considers the relationships between plants, soils, microorganisms, insects, water, climate and people. The aim is to design farming systems that strengthen these interactions while maintaining productive food production.

Permaculture

Permaculture is a systems design methodology that draws inspiration from natural ecosystems. Instead of focusing on individual farming techniques, it seeks to create productive landscapes that efficiently cycle nutrients, conserve water, increase biodiversity and become more resilient over time.

Traditional and Indigenous Agricultural Knowledge

Long before modern agricultural science, farming communities developed sophisticated knowledge through observation of soils, seasons, landscapes and plant behaviour. Indigenous and traditional agricultural systems continue to offer valuable insights into managing land in ways that support both productivity and long-term ecological resilience.

A Common Direction

Although these approaches differ in their methods, they increasingly converge around the same understanding. Healthy soils, biodiversity, nutrient cycling and functioning ecosystems create the conditions in which healthy plants can grow. In many respects, regenerative farming systems are different expressions of the same underlying principle: understanding how nature functions and applying those principles to produce nutritious food while maintaining productive and resilient agricultural systems.

Agriculture does more than produce food. It creates the growing environment that shapes the nutritional quality of the food we eat.

Finding More Nutrient-Dense Foods

Understanding where nutrition begins helps us make more informed food choices. While no single farming system or food guarantees better nutrition, there are practical ways to increase the likelihood of choosing foods grown in healthier environments.

Choose Ecologically Produced Food Where Possible

Organic food is now widely available and often provides the easiest place to begin. In some regions, biodynamic, regenerative or other ecologically produced foods may also be available through specialist retailers or directly from producers. These farming systems generally place greater emphasis on healthy soils, biodiversity and ecological processes that support plant growth.

Buy Directly From Local Producers

Farmers’ markets, farm shops and Community Supported Agriculture (CSA) schemes provide opportunities to buy directly from growers. Many small producers use ecological farming methods even when they are not formally certified, allowing consumers to learn more about how their food is produced.

Eat Seasonally

Seasonal foods are often more likely to have been harvested closer to their natural ripening stage and may spend less time in storage or transport. Eating with the seasons also encourages greater dietary diversity throughout the year.

Grow Some of Your Own Food

Even a small garden, balcony or windowsill can produce herbs, salad leaves or vegetables. Growing food provides greater control over how it is produced while reconnecting us with the natural processes that create nutrition.

Reconnect With Wild Foods

Wild edible plants, herbs and fruits often grow in biologically rich environments and can add diversity to the diet. Safe foraging requires knowledge, correct plant identification and careful harvesting, but it can also reconnect us with foods that have largely disappeared from modern diets.

Every food choice supports a particular way of growing food. By understanding where nutrition begins, we can make choices that support both our own health and the ecosystems upon which future food production depends.

Finally, nutrition is fundamental to sustaining health and high performance, but its story begins long before food reaches our plate. The evidence suggests that the nutritional quality of food has changed over time. Understanding these changes requires us to look beyond nutrition itself and consider the agricultural systems and ecosystems in which our food is produced.

Plants do not simply absorb nutrients from the soil. They continuously respond to the environment around them, producing the vitamins, minerals and thousands of other compounds that ultimately become part of our diet. The quality of that environment is influenced by the way we manage soils, water, biodiversity and agricultural landscapes.

By recognising these connections, we gain a broader understanding of nutrition, one that links human health with the health of the natural systems that sustain it. Ultimately, sustaining high performance is not only about making better food choices. It is also about recognising where nutrition begins.

Healthy ecosystems support healthy soils. Healthy soils support healthy plants. Healthy plants produce nutritious food. Nutritious food helps build human capability.