If you have started looking into personalised nutrition, you will have quickly noticed that there is more than one type of test available. Food intolerance tests. Gut microbiome tests. Blood biomarker tests. DNA tests. Each one comes with its own set of claims, its own price point, and its own way of describing what it can tell you about your body.
It is not immediately obvious what each of these approaches actually measures, how they work, or which questions they are designed to answer. And without that clarity, it is very hard to know which one - if any - is worth your time and attention.
This article explains all of it clearly. What each type of test looks at, how they differ from each other, and - crucially - what you actually do with the information once you have it. Because understanding how a test works is only useful if it leads somewhere practical.
These four approaches are not competing with each other. They are looking at different things - and understanding what each one is designed to measure makes it much easier to work out what is actually relevant for you.
Food intolerance tests measure your immune system's response to specific foods. The most common form tests for IgG antibodies - proteins produced by the immune system when it has been exposed to particular food antigens. Elevated IgG levels for a specific food are interpreted as a sign that your body may be reacting to it.
These tests are widely available and relatively affordable. They are best suited to people who suspect that specific foods are causing symptoms - digestive discomfort, bloating, skin issues, fatigue - and want a starting point for identifying which foods to investigate further. It is worth noting that the scientific evidence base for IgG food intolerance testing is still debated, and results are best interpreted alongside a qualified nutrition professional.
What intolerance testing cannot tell you is anything about your underlying biology - how your body is built to process nutrients, what your absorption profile looks like, or what your long-term nutritional needs are. It measures a current immune response, not a stable biological picture.
Gut microbiome tests analyse the composition of the bacteria living in your digestive system. Using a stool sample, they identify the types and relative proportions of microbial species present - and in some cases make recommendations about diet and supplementation based on what they find.
The gut microbiome is genuinely important for health. Research continues to strengthen the links between microbial diversity, digestion, immune function, and even mood. Microbiome testing is best suited to people who want to understand their gut health specifically - particularly those experiencing ongoing digestive symptoms or interested in the role of fermented foods, fibre, and prebiotics in their diet.
The limitation is variability. Your gut microbiome changes constantly - influenced by what you eat, your stress levels, medications, travel, and dozens of other factors. A microbiome test gives you a snapshot of one moment in time. It is a useful context, but it is not a stable foundation the way genetics is.
Blood biomarker tests measure specific markers in your blood - including vitamins and minerals, cholesterol, blood glucose, inflammatory markers, hormones, and more. They give you a picture of what is actually circulating in your body right now.
This is arguably the most direct measure of your current nutritional status. If your vitamin D is low, a blood test will show it. If your ferritin is depleted, a blood test will find it. For people who want to know specifically what is happening in their body at this moment - rather than what their biology is predisposed towards - blood testing is a powerful tool.
The limitation is the same as microbiome testing - it is a snapshot. Blood levels change with diet, season, lifestyle, and time. A vitamin D test in February will look very different from one in August. Blood testing tells you where you are right now. It does not tell you why, or what your body is genetically built to do with the nutrients it receives.
DNA nutrition tests - the focus of this article - analyse specific variants in your genetic code that influence how your body handles food. Unlike the other three approaches, your DNA does not change. You test once and the information does not expire, does not vary with the season, and is not affected by what you ate last week.
A DNA nutrition test looks at the genetic variants that have the strongest established links to how your body absorbs vitamins and minerals, processes different types of fat, regulates energy from carbohydrates, metabolises caffeine and alcohol, and responds to dairy. It tells you how your body is built to handle food - not what it is doing right now, but what it is genetically predisposed to do.
That permanence is both a strength and a limitation. It gives you a stable biological foundation that every food decision can be built on. But it cannot tell you what your blood levels look like today, or how your gut is currently functioning. It is most powerful when it informs a long-term approach to eating - and when it is connected to the food you actually eat, rather than sitting as a static report.
A note on combining approaches
These four approaches are genuinely complementary. Someone might use a blood test to identify a current deficiency, a microbiome test to understand their gut health, and a DNA test to understand the biological reasons behind both. None of them replaces the others - they answer different questions.
The thing that separates DNA testing from every other personalised nutrition approach is permanence.
Food intolerance tests measure a current immune response. Gut microbiome tests capture a snapshot of your bacterial composition at one moment in time. Blood biomarker tests tell you what is circulating in your body this week. All three of these things change - sometimes significantly - based on what you eat, how you sleep, how stressed you are, and what season it is.
Your DNA does not change. The variants you were born with are the variants you will always have. A DNA nutrition test gives you information that does not expire, does not fluctuate with your lifestyle, and does not need to be repeated every few months to stay relevant.
That permanence is a genuine strength - it means your genetic profile is a stable foundation you can build your understanding of nutrition on, rather than a snapshot that needs constant updating. But it also means it is answering a different question from the other three approaches. It is not asking what is happening in your body right now. It is asking how your body is built to handle food - the biological starting point that underlies everything else.
Your blood tells you where you are. Your genetics help explain why - and what to do about it in a way that is built around your biology rather than just correcting a number.
DNA is made up of billions of base pairs - the building blocks of your genetic code. Within that code, there are specific points where individual variation occurs. These are known as single nucleotide polymorphisms - or SNPs (pronounced snips). A SNP is a position in the DNA where one person might have one genetic letter and another person might have a different one.
SNPs are extremely common. Every person carries millions of them. Most have no meaningful effect on health or physiology. But a subset of SNPs - the ones that DNA nutrition tests are interested in - have been studied extensively and shown to have consistent, meaningful links to how the body handles specific nutrients. These are the variants that are relevant to nutrition science.
When you take a DNA nutrition test, a saliva sample is analysed to identify which variants you carry at these specific positions. The results are then mapped to nutritional implications based on the peer-reviewed research linking those variants to nutritional response. The genetic code itself is not what you see in your results - what you see is the plain language interpretation of what those variants mean for how your body handles food.
Not all DNA nutrition tests are built the same. The markers a test chooses to analyse, the evidence it draws on, and the way it translates genetic data into practical guidance vary considerably between providers. Boone's approach was developed alongside the Quadram Institute - one of the UK's leading centres for food and nutritional science - and shaped with input from nutritionists, dietitians, sports nutritionists, and geneticists.
The focus throughout was on the variants where the evidence is strongest and most consistent - not every genetic association that has ever appeared in a study, but the markers where the science reliably supports a nutritional implication. Here is what the Boone report covers across its five areas:
How your body handles carbohydrates and regulates blood glucose - including why two people can eat the same meal and experience very different energy levels and hunger responses.
How your body processes saturated fats, unsaturated fats, and omega-3 fatty acids - including how efficiently you convert plant-based omega-3 into the forms your body can use most readily.
How well your body processes dietary protein and which sources may be most effective for you - particularly relevant for athletes and active people thinking about fuelling and recovery.
How your body absorbs and processes a comprehensive set of micronutrients - including B vitamins (B2, B6, B9, and B12), calcium, choline, iron, sodium, vitamin A, vitamin C, vitamin D, vitamin E, and vitamin K. This is one of the most detailed and actionable sections of the report, addressing one of the most common gaps in standard dietary guidance.
How your body responds to caffeine, alcohol, and lactose - plus your genetic indicators around appetite regulation and snacking behaviour, and taste perception. These are often the insights that make the most immediate sense to people, because they provide a biological explanation for things they have noticed about themselves for years.
One of the most common concerns people have about DNA testing is that they will receive a wall of genetic data they have no idea how to interpret. Strings of letters, gene codes, probability percentages. Something that requires a science degree to make sense of.
The Boone Nutrition report is built around the opposite principle. Your genetic data is analysed behind the scenes - what you see in the app is the plain language interpretation of what your variants mean for your nutrition. Not gene codes. Not raw data. Actual, practical insight.
For each area of the report, you see your result, what it means, which genes are associated with it, why it matters for your diet, and how to work with it. You also get a clear guide to which foods to eat more of and which to be more mindful of - grounded in the same nutritional evidence base that informs government dietary guidelines.
The science is always there for people who want to go deeper. But you never need it to understand and act on your results.
Here is the problem with most DNA nutrition tests. You receive a report. It contains genuinely interesting information about your biology. And then it sits in your inbox, unread, because there is no clear connection between what it says and the food decisions you make every day.
Understanding that you have a genetic variant linked to lower vitamin D absorption is useful context. But if that insight does not connect to the food you are eating, the supplements you are taking, or the shopping list you are writing this weekend, it does not actually change anything.
This is the gap Boone is built to close. The genetic report is the starting point - not the end point. Once you have your results, the app becomes a daily tool that connects your personal biology to the food you actually eat.
Scan any food product using the Boone app and see immediately how it relates to your personal nutrition profile. If your result highlights a particular vitamin or mineral, you can see at a glance whether a food you are looking at is a meaningful source of it. If your fat handling profile suggests paying closer attention to the balance of saturated and unsaturated fats in your diet, the scanner makes that visible in real time.
This is not a traffic light system telling you what to avoid. It is your genetic profile made visible through the food you encounter every day - in your kitchen, at the supermarket, wherever you are making food decisions.
Log your meals, snacks, and supplements together in the Boone app to build a picture of your diet over time. The app tracks your macro nutrition - calories consumed versus your target, charted through the day - alongside your supplement intake, so you can see your full picture in one place rather than across separate tools.
Most nutrition tracking apps stop here. Boone goes further.
Most nutrition apps tell you how many calories you have eaten and some top-level macro data. Useful, but not really built for health. A diet cola looks like a great option on a calorie tracker. It is not.
Boone's micro nutrition dashboard goes deeper - showing you scores across the areas that actually drive how your body functions day to day. Sleep. Heart health. Brain and mood. Energy. Immunity. Each score is explained by the specific nutritional reasons behind it - not a vague wellness rating, but a direct connection between what you have eaten and how well it is supporting each area of your health.
And because the scores are built on your genetic profile, they reflect your personal nutritional needs - not an average. If your genetics suggest a higher need for certain B vitamins for energy, your energy score reflects that personally rather than against a generic baseline.
The research on dietary diversity is consistent and compelling - a varied diet is one of the strongest indicators of long-term nutritional health and gut wellbeing. Boone tracks this directly.
The diet diversity section of the app shows you how many different foods you have eaten across the day, with a target of 20 different foods across the week. It breaks this down by food group - vegetables, protein, grains, healthy fats, dairy, and fruit - with a progress indicator for each. It also tracks colour diversity through an Eat the Rainbow feature, showing how many different colour groups you have covered and which are missing.
If fruit is missing from your day, the app tells you. If you have covered five of six food groups, it shows you which one to add. Simple, visible, and immediately actionable.
This is where the what next question gets its most direct answer. Based on your genetic profile and your actual micro nutrition scores, Boone generates personalised food recommendations - not generic healthy eating advice, but specific foods that address your particular nutritional gaps.
The recommendations are organised into three sections. Biggest impact foods are the ones that address multiple gaps at once - the highest value additions to your diet based on where you are right now. Worth adding this week are strong complementary choices that support your overall nutritional picture. Already working hard for you shows which foods in your current diet are doing the most good - positive reinforcement for what is already working, not just a focus on gaps.
Each recommendation is tagged to the specific health benefits it supports - sleep, brain and mood, gut health, heart health - and linked directly to your genetics and your current intake. And every recommendation can be added to a personalised shopping list directly from within the app.
This is what the answer to 'what do I do now?' actually looks like. Not a genetic report to file away. A shopping list built around your biology, updated as your diet changes.
Any brand that only tells you what its product can do is not giving you the full picture. Here is what DNA nutrition testing - including Boone - cannot do, and why being clear about it makes the insights you do get more trustworthy, not less.
Your DNA is fixed - which means it tells you what your body is predisposed to do, not what it is currently doing. If you want to know whether you are actually deficient in vitamin D right now, a blood test will tell you that in a way a DNA test cannot. The two approaches answer different questions and work best together.
Your gut microbiome, your sleep, your stress levels, your overall diet quality, and your activity all interact with your genetics. A predisposition towards lower iron absorption does not mean you will be deficient - it means the picture of your needs is more nuanced than a population average can capture. Genetics gives you a biological starting point. Everything else you do with your diet and lifestyle shapes how those predispositions actually play out.
Nutrigenetics is a young and rapidly evolving field. The evidence base for specific well-studied variants - particularly those related to vitamin absorption, fat metabolism, caffeine, and lactose - is now substantial. But not every genetic link to nutrition is equally established, and the field continues to develop. Boone focuses on the markers where the evidence is strongest and most consistent, and does not include associations where the science is speculative or premature.
Boone is not a medical device. It is not a diagnostic tool and it does not replace advice from a GP, registered dietitian, or other healthcare professional. If you have specific health concerns or conditions that affect your diet, those conversations belong with a qualified professional. Boone can be a useful complement to those conversations - giving you more informed context to bring to them - but it does not substitute for them.
The four approaches to personalised nutrition testing each answer different questions. Here is a simple guide to which one - or which combination - is most relevant depending on what you are trying to understand.
For most people who are already broadly engaged with their nutrition and want to go deeper - understanding why their body responds to food the way it does, connecting that understanding to their daily diet, and building a long-term picture rather than a snapshot - DNA testing is the most appropriate starting point. It gives you the biological foundation that makes everything else more meaningful.
The question most people start with when they look into DNA nutrition testing is how it works. But the more important question is what happens after.
A test that gives you a report and leaves you to figure out the rest has limited value. The information is interesting, but if it does not change what you eat on Monday morning, it has not really done its job.
What makes DNA nutrition testing genuinely useful is what it connects to. Your genetics tell you how your body is built to handle food. The Boone app connects that picture to the food you actually eat - through your food log, your food scanner, your micro nutrition scores, your diet diversity, and your personalised food recommendations. A shopping list built around your biology. A daily picture of how your diet is working for you specifically, not for an average.
That is what the what next question looks like when it is properly answered. Not a report. A tool you use every day.
