UNDERSTANDING WHAT YOU EAT
Most people eat several times a day without giving much thought to what is actually in their food, where it came from, or what it does once it enters the body. But in a world where food products come with lengthy ingredient lists, bold health claims, and confusing terminology, being an informed eater has never been more important. Understanding what you eat does not mean obsessing over every ingredient or following rigid rules. It means developing the knowledge to make confident, informed choices — in the supermarket, in the kitchen, and at the table. Whether you are a home cook trying to feed your family well, a culinary student building your foundational knowledge, or a professional working in food service, this is knowledge that applies to everyone.
How to Read and Interpret a Food Label
Food labels are one of the most powerful tools available to any cook or consumer — but only if you know how to read them. In most countries, food manufacturers are legally required to provide specific information on their packaging, and understanding what each section means puts you firmly in control of what you are eating.
The Ingredients List
The ingredients list is perhaps the most revealing section of any food label. By law, ingredients must be listed in descending order of weight — meaning the first ingredient listed is present in the greatest quantity, and the last is present in the smallest. This single piece of knowledge is enormously useful. If sugar is the first ingredient in a product marketed as a healthy breakfast option, that tells you something important. If a loaf of bread lists whole wheat flour first followed by a long list of additives, that tells you something too.
Reading the ingredients list with a critical eye means looking beyond the front of the pack — where manufacturers place their most appealing claims — and going straight to the source. A product with five recognisable ingredients is fundamentally different from one with twenty-five, many of which require a chemistry degree to identify.
The Nutrition Information Panel
The nutrition information panel provides a breakdown of the key nutrients in a product, typically presented per 100g and per serving. Understanding how to use this information is essential for making meaningful comparisons between products.
The key figures to understand are energy — expressed in both kilocalories and kilojoules — fat, saturated fat, carbohydrates, sugars, protein, and salt. When comparing two similar products, always compare them per 100g rather than per serving, as serving sizes are defined by the manufacturer and can vary significantly between products, making direct comparison misleading.
Pay particular attention to saturated fat and added sugars, as these are the nutrients most consistently linked to health concerns when consumed in excess. Also note the salt content — many processed foods contain surprisingly high levels of sodium, even in products that do not taste particularly salty.
Traffic Light Labelling
Many products in the UK and Europe use a traffic light labelling system on the front of the pack, colour-coding key nutrients as green, amber, or red based on whether the levels are low, medium, or high. Green indicates a low level of a nutrient — generally positive. Amber indicates a medium level — acceptable in moderation. Red indicates a high level — something to be mindful of, particularly if you are consuming multiple red-coded products in a day.
Traffic light labelling is a useful quick reference tool, but it has limitations. A product can display multiple green lights and still be nutritionally poor if it lacks essential vitamins, minerals, or fibre. Conversely, a product with an amber or red light — such as olive oil, which is high in fat — can be an entirely healthy choice when consumed in appropriate quantities. Traffic lights are a guide, not a verdict.
Allergen Information
By law, the 14 major allergens must be clearly indicated on food labels, either by being listed in bold within the ingredients list or by being declared separately in an allergen box. The 14 allergens are celery, cereals containing gluten, crustaceans, eggs, fish, lupin, milk, molluscs, mustard, peanuts, sesame, soybeans, sulphur dioxide and sulphites, and tree nuts. For anyone cooking professionally or for people with allergies or intolerances, understanding allergen labelling is not optional — it is a fundamental responsibility.
Health Claims
Food packaging is covered in health claims — "high in protein", "low fat", "a source of fibre", "no added sugar", "natural". In most countries, these claims are regulated and must meet specific criteria to be used legally. However, regulation does not always prevent misleading framing. A product labelled "low fat" may be high in sugar. A product labelled "no added sugar" may still contain significant natural sugars. "Natural" has no universal legal definition in many countries and can be applied very broadly. Developing the habit of reading the ingredients list and nutrition panel rather than relying on front-of-pack claims is one of the most valuable skills any informed consumer can have.
The Role of Additives in Modern Food
Food additives are substances added to food during processing or preparation for a specific technological purpose — to preserve freshness, improve texture, enhance flavour, maintain colour, or extend shelf life. They are one of the most misunderstood aspects of the modern food supply, simultaneously feared by some and completely overlooked by others.
In most countries, food additives must be approved by a regulatory body before they can be used in food production. In the European Union, approved additives are assigned an E number — a classification system that covers a wide range of substances including preservatives, antioxidants, emulsifiers, stabilisers, thickeners, gelling agents, flavour enhancers, colours, and sweeteners. The presence of an E number does not automatically indicate something harmful — many E numbers are derived from entirely natural sources. Vitamin C, for example, is classified as E300 when used as an antioxidant in food production.
Preservatives extend the shelf life of food by inhibiting the growth of bacteria, moulds, and yeasts. Common preservatives include sodium benzoate, used in soft drinks and condiments, and nitrates and nitrites, used in cured meats such as bacon and ham to prevent the growth of dangerous bacteria including Clostridium botulinum. Without preservatives, many foods would spoil far more rapidly, raising both food waste and food safety concerns.
Emulsifiers are used in food production for the same reason they are used in cooking — to combine ingredients that would not otherwise mix. Lecithin, derived from soya or sunflower, is one of the most widely used food emulsifiers, found in chocolate, margarine, and many baked goods. Mono and diglycerides of fatty acids are another common emulsifier, used to improve texture and extend shelf life in bread, ice cream, and confectionery.
Colours are added to food to restore colour lost during processing, to ensure consistency between batches, or to make food more visually appealing. Some colours are derived from natural sources — beetroot red, annatto from seeds of the achiote tree, and turmeric yellow are all natural food colours used widely in the food industry. Others are synthetic — and some synthetic colours, particularly certain azo dyes, have been linked to hyperactivity in children, leading to voluntary restrictions on their use in some markets.
Flavour Enhancers are substances that enhance the existing flavour of a food without contributing a significant flavour of their own. The most widely known is monosodium glutamate — MSG — which enhances savoury, umami flavours. Despite its somewhat controversial reputation in some consumer circles, MSG has been extensively studied and is considered safe by regulatory authorities worldwide. Glutamates occur naturally in many foods including tomatoes, parmesan cheese, soy sauce, and mushrooms — foods universally recognised for their depth of flavour.
Sweeteners are used to replace sugar in reduced calorie or sugar-free products. They fall into two categories — bulk sweeteners such as sorbitol and xylitol, which provide a similar volume to sugar with fewer calories, and intense sweeteners such as aspartame, saccharin, and stevia, which are many times sweeter than sugar and are used in very small quantities. The safety and long-term health effects of artificial sweeteners continue to be an active area of research and debate.
Understanding additives does not require memorising every E number. It requires developing a general awareness of why they are used, where they are typically found, and how to interpret their presence on an ingredients list with neither panic nor indifference.
Natural vs Artificial Ingredients — What the Difference Really Means
The word "natural" is one of the most powerful and most misused words in the food industry. It appears on packaging, in advertising, and in everyday food conversation as a signifier of quality, safety, and wholesomeness. But what does it actually mean?
In truth, there is no single universally agreed legal definition of "natural" when applied to food labelling in many parts of the world. In the absence of a strict legal framework, the term is applied very broadly by food manufacturers, sometimes meaningfully and sometimes misleadingly.
In general food conversation, a natural ingredient is understood to be one that comes from a plant, animal, or mineral source and has undergone minimal processing. An artificial ingredient is one that has been synthesised chemically and does not occur in nature in the same form. However, even this distinction is less clear-cut than it appears.
Natural does not automatically mean safe or healthy. Many of the most toxic substances known to exist — ricin from castor beans, botulinum toxin from the bacterium Clostridium botulinum, solanine from unripe potatoes — are entirely natural. Conversely, many synthetic ingredients used in food production have been extensively tested and proven safe for human consumption.
Artificial does not automatically mean harmful. Synthetic vanillin — the artificial version of vanilla flavouring — is chemically identical to the vanillin found naturally in vanilla pods. The distinction between natural and artificial in this case is one of source and cost, not of chemical composition or safety. Many artificial flavourings are created to replicate natural flavour compounds that are expensive, scarce, or difficult to extract at scale.
Natural flavourings — a term commonly seen on food labels — refers to flavouring substances derived from plant or animal sources. However, the term covers a very broad range of substances and processes. A natural strawberry flavouring may contain compounds derived from strawberries, but it may also contain compounds derived from other natural sources that contribute to the overall flavour profile. The word "natural" in this context describes the origin of the flavouring, not the simplicity of its production.
Artificial flavourings are synthesised chemically. They are often cheaper to produce, more consistent in flavour, and more stable over time than their natural counterparts. In many blind taste tests, consumers are unable to distinguish between a food made with natural flavouring and one made with the artificial equivalent.
The most useful framework for thinking about natural versus artificial ingredients is not to treat natural as inherently good and artificial as inherently bad, but to consider the purpose of each ingredient, the evidence regarding its safety, and where it sits within your overall diet. A diet built primarily on whole, minimally processed foods — regardless of whether individual components are technically natural or artificial — is likely to be far more beneficial than one built on highly processed products regardless of their "natural" credentials.
What Processed Food Actually Is and Where It Fits in a Balanced Diet
"Processed food" is one of the most loaded and misunderstood terms in contemporary food culture. It is frequently used as shorthand for everything that is wrong with the modern diet, conjuring images of fast food, sugary snacks, and ready meals packed with unpronounceable ingredients. But the reality is considerably more nuanced — and understanding it properly allows you to make far better, more balanced decisions about what you eat.
What Does Processing Actually Mean?
Food processing refers to any deliberate change made to a food before it is consumed. By this definition, almost everything we eat has been processed to some degree. Washing vegetables is processing. Cooking meat is processing. Grinding wheat into flour is processing. Pasteurising milk is processing. The question, therefore, is not whether food has been processed, but to what degree and in what way.
The NOVA classification system, developed by researchers at the University of São Paulo, provides one of the most useful frameworks for thinking about food processing. It divides foods into four groups based on the extent and purpose of processing.
Group 1 — Unprocessed or Minimally Processed Foods includes fresh, frozen, or dried fruits, vegetables, meat, fish, eggs, and milk. These foods are consumed in their natural state or have undergone only minimal processing — cleaning, cutting, drying, freezing, pasteurising — to make them safe and convenient to eat.
Group 2 — Processed Culinary Ingredients includes substances extracted from natural foods and used in cooking — oils, butter, flour, sugar, salt, and vinegar. These are not typically consumed on their own but are used to prepare and cook Group 1 foods.
Group 3 — Processed Foods includes foods made by combining Group 1 and Group 2 ingredients and applying relatively straightforward preservation or transformation processes. Tinned vegetables, cured meats, traditionally made cheeses, freshly baked bread, and smoked fish all fall into this category. These foods have been processed, but in ways that are well understood, often traditional, and not inherently problematic.
Group 4 — Ultra-Processed Foods is where the real concerns lie. Ultra-processed foods are industrial formulations made primarily from substances extracted from foods or derived from food constituents — such as hydrogenated fats, modified starches, protein isolates, and high-fructose corn syrup — combined with cosmetic additives including artificial colours, flavours, emulsifiers, and preservatives. Examples include mass-produced packaged snacks, carbonated soft drinks, instant noodles, reconstituted meat products, and many breakfast cereals. These products typically contain five or more ingredients, many of which would not be found in a domestic kitchen.
The Evidence on Ultra-Processed Foods
A growing body of research associates high consumption of ultra-processed foods with an increased risk of obesity, type 2 diabetes, cardiovascular disease, certain cancers, and poor mental health outcomes. Exactly why this association exists is still being studied — it may be related to the nutritional composition of these foods, the effects of specific additives, the displacement of more nutritious foods in the diet, or the way ultra-processed foods are designed to override normal satiety signals and encourage overconsumption.
What is clear is that populations with diets built primarily around Group 1 and Group 3 foods — such as traditional Mediterranean or Japanese diets — consistently show better health outcomes than those with diets dominated by ultra-processed products.
Where Processed Food Fits in a Balanced Diet
The goal is not to eliminate all processed food from your diet — that would be neither realistic nor necessary. Tinned tomatoes, frozen vegetables, traditionally made cheese, good quality bread, and many fermented products are all processed to some degree and can form part of a nutritious and balanced diet. The aim is to build your diet primarily around whole and minimally processed foods, use Group 2 and Group 3 foods as tools and accompaniments, and treat Group 4 ultra-processed products as occasional rather than everyday choices.
Understanding the spectrum of food processing allows you to navigate the modern food environment with clarity and confidence — not with fear or rigid rules, but with genuine knowledge about what you are eating, why it was made the way it was, and how it fits into the bigger picture of your health and wellbeing.
Why Understanding What You Eat Matters
Knowledge is the most powerful ingredient in any kitchen. When you understand what is in your food, how it was made, and what it does in your body, you become a more capable cook, a more confident consumer, and a more informed advocate for the people you feed. You do not need a degree in nutrition or food science to eat well — you just need the curiosity to ask the right questions and the knowledge to understand the answers. That is exactly what this section is here to provide.