The Evolution of Food Chemistry: From Early Discoveries to Modern Science

Every time you read a nutrition label, check for food additives, or wonder why lemon juice tastes sour, you’re touching the legacy of food chemistry – a scientific discipline with roots stretching back centuries. What started as scattered observations by ancient civilizations eventually grew into a rigorous field of study, one that now shapes global food safety, nutrition policy, and even molecular gastronomy. Here’s how it all unfolded.

Ancient roots: when food science was a matter of survival 🔗

Long before anyone understood molecules or chemical reactions, ancient civilizations in Egypt, Greece, Rome, Persia, China, and India recognised a practical connection between food and health. The Egyptians used garlic as medicine and salt to preserve fish and meat – a technique dating back at least 4,000 years. Hippocrates, the ancient Greek physician, recommended chewing food thoroughly and eating in moderation. In medieval Germany, the Christian mystic Hildegard of Bingen offered surprisingly sound dietary advice, including a preference for cooked over raw foods.

These early practices were based entirely on observation and trial. Nobody understood why salt kept meat from spoiling or why citrus fruits seemed to ward off disease. The underlying chemistry remained a mystery for centuries. But these traditions laid the groundwork – proving that food wasn’t just fuel; it had properties that could heal, preserve, and harm.

Fermentation is another example of ancient food chemistry in action. Cheese-making is estimated to be over 8,000 years old, and evidence of wine fermentation from China dates back roughly 9,000 years. These processes relied on biochemical reactions that wouldn’t be scientifically understood for millennia.

The golden era of discovery: 1780-1850 🔗

The late 18th and early 19th centuries marked a dramatic turning point. Food chemistry shifted from casual observation to systematic laboratory science, thanks to a handful of pioneering chemists who began isolating and identifying specific compounds in food.

Carl Wilhelm Scheele: the first food chemistry pioneer 🔗

The Swedish chemist Carl Wilhelm Scheele (1742-1786) is arguably the first true food chemist. Despite having little formal education – he trained as a pharmacist’s apprentice starting at age 14 – Scheele became one of the most prolific experimental chemists of his era. Working in modest laboratories, often with equipment he built himself, he isolated a remarkable number of organic compounds from everyday foods.

In 1785, Scheele isolated malic acid from apples – one of the earliest documented cases of a food compound being chemically identified. But this was just one of many achievements. Between roughly 1770 and 1786, he discovered or isolated tartaric acid, oxalic acid, lactic acid, uric acid, citric acid (from lemons), lactose (the sugar in milk), glycerol, and casein. He also identified several inorganic acids and even discovered oxygen independently of Joseph Priestley and Antoine Lavoisier.

A full tally of his discoveries includes four gases, six inorganic acids, eight organic acids, and the isolation of glycerol and lactose. Scheele’s method was simple but effective: he systematically extracted substances from common foods and studied how they behaved under different conditions. His approach essentially created the first food chemistry laboratory protocols.

Sadly, Scheele had a dangerous habit of tasting the substances he worked with, including compounds of arsenic and lead. He died at just 43, and much of his work was later attributed to more famous contemporaries.

Antoine Lavoisier: connecting food to energy 🔗

While Scheele was isolating compounds from food, the French chemist Antoine Lavoisier (1743-1794) was asking a different question: what happens to food after we eat it?

Lavoisier, widely regarded as the father of modern chemistry, was the first to design laboratory equipment to test what happens to food once it is consumed. Before his research, scientists knew that ingested food weighed more than what was excreted, and they attributed the difference to perspiration. Lavoisier proposed something far more radical – that food was fuel, and the body burned it much like an engine burns coal, releasing carbon dioxide as a byproduct.

In the early 1780s, he built an ice calorimeter to test this idea. He placed a guinea pig inside a chamber surrounded by ice and measured how much ice the animal’s body heat melted. By comparing this metabolic heat to the heat produced by burning charcoal, he confirmed his theory. Lavoisier also demonstrated that oxygen consumption increased during physical work, exposure to cold, and digestion – establishing himself as the father of calorimetry.

In 1787, Lavoisier gave malic acid its formal name, derived from the Latin word for apple (mālum). His work on organic acids in fruits helped explain why different fruits have different tastes – a question that had puzzled natural philosophers for centuries.

Lavoisier’s contributions went beyond individual discoveries. He introduced a rigorous, measurement-based approach to chemistry that replaced the old “phlogiston” theory and gave future food scientists a reliable framework. His work made it clear that food wasn’t just sustenance – it was a source of chemical energy that the body processed through measurable reactions.

Sir Humphry Davy and the first food chemistry textbook 🔗

In 1813, Sir Humphry Davy published Elements of Agricultural Chemistry, the first book dedicated to agricultural and food chemistry. Written for the Board of Agriculture in the United Kingdom, this text went through five editions and served as a foundational reference for the profession worldwide. It brought together the scattered findings of earlier chemists into a coherent discipline, helping food chemistry gain recognition as a legitimate field of study.

Mid-19th century: identifying the building blocks of food 🔗

By the mid-1800s, scientists had determined that the primary elements in food are carbon, nitrogen, hydrogen, and oxygen, and had classified food components into carbohydrates, fats, proteins, and water. But understanding the detailed chemistry of each category was still a work in progress.

Justus von Liebig and macronutrient science 🔗

German chemist Justus von Liebig advanced the field significantly by inventing the ‘kaliapparat’, a specialised piece of glassware for analysing carbon in organic compounds. Appointed professor at the University of Giessen at just 21, von Liebig helped train an entire generation of nutrition researchers. He emphasised the importance of specific nutrients – proteins, carbohydrates, and fats – and introduced concepts like essential amino acids that remain central to nutritional science today.

Von Liebig’s students continued his legacy. Carl von Voit and Max Joseph von Pettenkofer built a human-sized respiration chamber to measure daily carbon and nitrogen balances, making it possible to estimate protein requirements for the first time. Much of this research was driven by practical concerns – governments wanted to find the cheapest way to feed soldiers, prisoners, and workers.

Jean-Baptiste Boussingault and balance trials 🔗

In the 1830s, French chemist Jean-Baptiste Boussingault pioneered a method known as balance trials. He compared the nitrogen content of feed given to animals with the nitrogen in their excrement and milk. This approach proved that animal feed contained enough nitrogen (a key component of protein) to meet bodily needs – ending the old speculation that animals absorbed additional nitrogen from the atmosphere. Balance trials became a cornerstone of nutritional research methodology.

The rise of food safety and regulation 🔗

As industrialisation expanded in the 19th century, so did concerns about food adulteration. Manufacturers added all sorts of substances to food – some harmless, others dangerous. Chalk was mixed into flour, lead compounds were used as food colouring, and formaldehyde was added as a preservative.

In 1874, the Society of Public Analysts was formed in England, with the mission of applying analytical chemistry methods to protect public health. Their early investigations focused on bread, milk, and wine – the dietary staples most commonly adulterated.

In the United States, Harvey W. Wiley of the U.S. Department of Agriculture led a campaign against food adulteration during the late 19th century. His research and advocacy were instrumental in the creation of the U.S. Food and Drug Administration (FDA) in 1906. Meanwhile, the American Chemical Society established its Agricultural and Food Chemistry Division in 1908, formally recognising food chemistry as an academic and professional discipline.

The 20th century: vitamins, preservation, and a new scientific identity 🔗

The early 1900s brought a wave of discoveries that transformed food chemistry from a study of basic composition into a fully fledged science of nutrition and food technology.

The vitamin revolution 🔗

Perhaps the most significant development of the 20th century was the discovery of vitamins – trace substances in food essential for human health. Polish biochemist Casimir Funk coined the term “vitamin” in 1912 after isolating thiamine, the nutrient that prevents beriberi. This discovery built on earlier work by Japanese physician Takaki Kanehiro, who had shown in the 1870s that beriberi resulted from poor diet rather than infection.

Vitamin discoveries followed rapidly. In 1913, American biochemist Elmer Verner McCollum identified the first fat-soluble vitamin (vitamin A) through experiments with rats. He later proved that vitamin D – not vitamin A – prevents rickets. Vitamin C was formally isolated in 1928, finally explaining the centuries-old observation that citrus fruits prevented scurvy among sailors.

These findings proved that food contains essential micronutrients beyond proteins, fats, and carbohydrates. Foods weren’t just energy sources – they were complex delivery systems carrying dozens of vital substances in trace amounts. This understanding led directly to food fortification programs (adding iodine to salt, vitamins to flour) and the dietary guidelines we follow today.

The Maillard reaction and flavour science 🔗

In 1912, French chemist Louis Maillard became the first to describe the chemical reactions responsible for the flavours, colours, and aromas of grilled, baked, and sautéed foods. The Maillard reaction – a complex interaction between amino acids and sugars when heated – explains why bread develops a golden crust, why coffee smells so inviting, and why grilled steak tastes the way it does.

It took decades for scientists to fully understand the reaction’s chemistry. By the 1950s, advances in gas chromatography and mass spectrometry gave food scientists the tools to measure Maillard products precisely, opening the door to modern flavour chemistry.

Food chemistry becomes a formal discipline 🔗

The single-grain experiments conducted between 1907 and 1911 at American universities demonstrated that no single grain could provide all the nutrients needed for health – a finding that underscored the importance of dietary diversity and fuelled further research. The expansion of food chemistry programs in universities worldwide cemented the field’s academic identity. In 1995, the Institute of Food Technologists established a dedicated Food Chemistry Division, marking the discipline’s full maturation.

Food chemistry today and beyond 🔗

Modern food chemistry has evolved far beyond what Scheele and Lavoisier could have envisioned. Today, food chemists work on molecular gastronomy, engineering entirely new textures and flavour experiences. They develop plant-based protein alternatives that closely replicate the taste and texture of meat. Functional foods – designed to deliver health benefits beyond basic nutrition – represent a growing area of research and commerce.

The field is also grappling with urgent global challenges. Regulatory frameworks like the European Union’s E-number system for approved additives, introduced in 1962, continue to evolve as analytical chemistry uncovers potential risks from food additives. Meanwhile, nutrigenomics – the study of how our genes interact with the food we eat – represents the cutting edge of the discipline, promising personalised nutrition recommendations based on individual genetic profiles.

Sustainability is another frontier. Food chemists are researching alternative protein sources, more efficient production methods, and technologies to reduce food waste – all critical as the global population continues to grow.

Key takeaways from the history of food chemistry 🔗

The evolution of food chemistry follows a clear arc: from ancient preservation techniques and folk wisdom, through the systematic compound isolation of the 1780-1850 period, to the vitamin discoveries and food safety regulations of the 20th century, and finally to the molecular-level research of today. Each era built on the last, driven by a combination of scientific curiosity, public health needs, and commercial demand.

A few milestones stand out. Scheele’s isolation of organic acids in the 1780s proved that food could be broken down into identifiable chemical components. Lavoisier’s calorimetry work established that food is fuel for the body. Davy’s textbook formalised the discipline. The vitamin discoveries of the early 1900s revealed an entirely new category of essential nutrients. And the regulatory frameworks born from food adulteration scandals ensured that food chemistry served public welfare, not just commercial interests.

What do you think? How has learning about the historical origins of food chemistry changed the way you look at everyday foods like milk, apples, or bread? And which modern application of food chemistry – molecular gastronomy, nutrigenomics, or plant-based alternatives – do you think will have the greatest impact on how we eat in the coming decades?

References

1. https://www.nature.com/articles/468S16a
2. https://www.newfoodmagazine.com/article/112037/a-chemical-history-of-food/
3. https://www.britannica.com/biography/Carl-Wilhelm-Scheele
4. https://www.newworldencyclopedia.org/entry/Food_chemistry
5. https://www.frontiersin.org/news/2022/03/18/children-in-science-carl-wilhelm-scheele-the-forgotten-chemist
6. https://library.med.utah.edu/NetBiochem/nutrition/lect1/4_3a.html
7. https://www.sciencehistory.org/stories/magazine/processed-food-science-and-the-modern-meal/
8. https://www.ebsco.com/research-starters/nutrition-and-dietetics/nutrition-science-and-dietetics
9. https://www.sciencemuseum.org.uk/objects-and-stories/chemistry/food-chemical-history