Can Your Genes Influence the Foods You Crave? The Science of Taste Preferences Explained

Can Your Genes Influence the Foods You Crave?

What genetics can tell us about sweet and bitter taste, food preference and eating behaviour—and why DNA is only one part of the story.

Two people can taste the same dark chocolate and have genuinely different experiences. One notices fruit and cocoa; the other mainly detects bitterness. Those differences are shaped partly by inherited biology—but the path from a DNA variant to a food craving is long, indirect and strongly influenced by experience.

Genetic studies are helping researchers understand variation in taste and intake. They are not showing that one gene creates a craving, fixes a person’s diet or makes healthy eating impossible.

Key Takeaways

1. Taste perception, food liking, food choice and craving are related but distinct traits.

2. Genetic variants can contribute to differences in taste and intake, but individual effects are usually modest.

3. TAS2R38 is a well-studied example in bitter perception; it does not explain every bitter-food preference or overall diet.

4. Large genetic studies suggest that food intake also involves brain, metabolic and behavioural pathways—not only receptors on the tongue.

5. Most findings describe population averages and may not transfer equally across ancestries, ages or food environments.

6. Current evidence does not support using a consumer DNA test to prescribe a precise cravings diet.

7. Taste remains adaptable through exposure, learning, cooking, culture and changes in health and environment.

Taste, Preference, Choice and Craving Are Not the Same

Taste sensitivity describes how strongly someone detects a stimulus. Taste preference describes how much of that sensation they like. Food choice is the behaviour that follows within a real environment of price, access, habit and culture. A craving is an intense desire for a specific food or food type.

A person may be highly sensitive to bitterness yet learn to enjoy coffee. Someone may like sweetness but rarely buy desserts. A genetic association with sugar intake therefore does not automatically mean a gene caused sugar cravings.

How Genes Can Affect Taste

Genes provide instructions for receptors, channels, enzymes and signalling proteins involved in sensory processing. Variation in those instructions can alter how a stimulus is detected or how strongly a signal is transmitted. Genes may also influence smell, metabolism, appetite, learning and reward—all of which can affect eating.

Most traits are polygenic: many variants each contribute a small amount. Their effects unfold within an environment. This is different from a rare single-gene disorder, where one variant may have a large and predictable effect.

The Classic Example: TAS2R38 and Bitter Taste

TAS2R38 encodes a bitter-taste receptor. Common variants are associated with how strongly people perceive compounds such as phenylthiocarbamide and propylthiouracil, often used in taste research. This has led to popular labels such as ‘taster’, ‘non-taster’ and ‘supertaster’.

The labels can be useful shorthand, but they oversimplify. Bitter perception involves many receptors and foods contain mixtures of aromas, textures and compounds. Age, smoking, illness, medicines and exposure also matter. Systematic reviews find associations between TAS2R38 variants and some taste preferences, while results for actual food intake remain variable.

Sweet Taste Is More Complicated Than a ‘Sweet-Tooth Gene’

Sweet compounds activate receptor systems that include TAS1R2 and TAS1R3. It would be reasonable to expect variants in those receptor genes to explain who eats more sugar, but large studies paint a more complex picture.

A 2019 genome-wide association study analysed sweet perception and intake across Australian, US and UK samples. It found a genome-wide association between total sugar intake and a variant within FTO and limited support for several obvious sweet-receptor candidates. The authors concluded that genes beyond peripheral taste receptors—including brain-related pathways—contribute to sweet perception and intake.

That is evidence of association, not a personal forecast. Dietary intake is difficult to measure and FTO is involved in broader biology. Read the companion guide Is a Sweet Tooth Genetic?.

Genes May Influence What Feels Rewarding

The brain integrates taste with smell, memory, current hunger and expected reward. Genetic variation in neurotransmission or metabolic pathways could therefore influence food behaviour without changing taste receptors themselves. Genome-wide studies of beverage consumption, for example, have identified associations that appear related to psychoactive or behavioural effects rather than taste alone.

This is one reason a food preference cannot be read directly from the tongue—or from a handful of DNA variants. Liking, wanting and choosing are connected but not interchangeable processes.

Smell, Texture and Temperature Change Flavour

Much of what we casually call taste is flavour: the brain’s combined interpretation of taste, retronasal smell, texture, temperature and irritation. Genes can influence aspects of these systems too, but a meal is not a laboratory solution containing one chemical.

Aroma explains why food can seem flat during a blocked nose. Texture helps distinguish crisp from stale. Temperature changes aroma release and sensory intensity. Memories and expectations add another layer before the first bite is swallowed.

Why Genetic Studies Need Careful Interpretation

Before treating a genetic association as nutrition advice, ask:

1. Was the trait measured directly, or estimated from a food questionnaire?

2. Was the finding replicated in an independent sample?

3. How large was the effect for each variant?

4. Who participated, and were other ancestries, ages and cultures represented?

5. Does the result concern perception, liking, intake or a health outcome?

6. Was the association observational, or did an intervention show that acting on it improved health?

Genome-wide studies test enormous numbers of variants, so replication and stringent statistical thresholds are essential. Even a genuine association may explain only a tiny fraction of individual variation and may be useful for research without being useful for personal decision-making.

Ancestry and Environment Matter

Many large genetic datasets have overrepresented people of European ancestry. Variant frequencies, linkage patterns, cultural foods and environments differ between populations, so results may not transfer directly.

The food environment can also amplify or mute a predisposition. A preference cannot lead to frequent consumption if the food is unavailable, unaffordable or culturally unfamiliar. Conversely, constant marketing and easy access can turn a modest preference into a repeated habit.

Can a DNA Test Tell You What to Eat?

Consumer nutrigenetic tests may report variants linked with taste, caffeine, lactose or nutrient metabolism. Their analytical ability to identify a variant is not the same as clinical ability to improve a person’s diet or health. The interpretation may rely on small studies, indirect outcomes or associations that do not justify a precise prescription.

In the Food4Me randomised trial, personalised advice improved some dietary behaviours compared with conventional advice, but adding phenotype and genotype information did not make the advice more effective. Personalisation can still be useful when it reflects foods, culture, budget, symptoms, skills and goals; it does not have to begin with DNA.

Food Preferences Remain Adaptable

Genes provide a starting point, not a permanent menu. Repeated exposure, preparation method, social experience and learning can change acceptance. A meta-analysis of vegetable studies found that repeated exposure increased liking and intake, although effects were generally small and evidence about long-term persistence was limited.

Adaptation does not mean everyone must learn to love every food. It means a first reaction is not always the final one. Changing bitterness with roasting, balancing acidity, altering texture or combining a new food with something familiar can make exposure more acceptable.

The Gut and Microbiome Are Not Genetic Destiny

The gut and brain communicate through nerves, hormones, immune pathways and metabolites. Genes can influence aspects of digestion and signalling, while diet and other exposures shape the microbiome. Read The Gut–Brain Axis Explained and why everyone’s gut microbiome is different.

Current evidence cannot combine a consumer genetic result and microbiome profile to reveal exactly which foods someone will crave. Claims of that precision run ahead of validated clinical tools.

A More Useful Form of Personalisation

Personalised eating can begin with observable information:

1. Notice which taste, aroma and textures you genuinely enjoy or avoid.

2. Identify whether the issue is sensitivity, dislike, hunger, craving, convenience or a physical symptom.

3. Keep general healthy-eating principles, then adapt foods and preparation methods to your culture, budget and needs.

4. Use gradual exposure when you want to broaden variety; avoid forcing or moralising food preferences.

5. Review medicines, dental health, smell, taste and medical symptoms when preferences change suddenly.

6. Seek an accredited practising dietitian for restrictive eating, nutritional risk or clinically complex needs.

Food Choice Is More Than Biology

Choice happens within families, workplaces, shops and cultures. Time, income, advertising, cooking facilities, stress and food access can matter more than a small genetic effect. Recognising this prevents biology from becoming a new form of blame.

It also explains why broad dietary guidance remains useful. People may reach a varied, nourishing pattern through very different meals. Food structure and processing contribute to that experience; explore The Food Matrix Explained and Whole Foods vs Ultra-Processed Foods.

Where Bone Broth Fits

Bone broth can be a savoury drink or cooking ingredient and may contribute protein, depending on the product and serve. It can add umami and aroma to soups, grains, legumes, vegetables and sauces, which may help make nutritious meals enjoyable.

It does not change taste genes, control cravings or create personalised nutrition on its own. Collagen-rich protein is not a complete protein source, so dietary variety remains important. Read the complete guide to bone broth or shop Broth & Co Everyday Wellness.

Common Myths About Genes and Food Preference

Myth: One Gene Controls Your Sweet Tooth

Sweet perception and intake are complex, polygenic traits shaped by sensory, brain, metabolic and environmental factors.

Myth: If a Food Tastes Bitter, You Have a ‘Bad’ Gene

Bitter sensitivity is normal human variation. No common taste genotype is morally better, and food liking depends on more than receptor sensitivity.

Myth: Your DNA Can Reveal the Perfect Diet

Current nutrigenetic evidence does not support a universally accurate gene-based diet prescription. General guidance and individual circumstances still matter.

Myth: Genetic Influence Means Behaviour Cannot Change

A genetic contribution is not genetic determination. Exposure, preparation, learning and environment can alter food acceptance and choice.

Myth: The Microbiome Completes the Prediction

Microbiome science is valuable but does not yet provide a validated cravings forecast when combined with consumer DNA testing.

Frequently Asked Questions

Can genetics influence the foods we crave?

Yes, indirectly and modestly. Genes may influence taste, smell, appetite, reward or metabolism, but cravings also depend heavily on learning, hunger, sleep, stress and availability.

Why do people experience the same food differently?

Flavour combines taste, smell, texture, temperature, expectation and memory. Each component varies between people and across time.

Can food preferences change?

Yes. Repeated exposure and different preparation methods can increase acceptance for some foods, although effects vary and nobody must enjoy every food.

Is personalised nutrition scientifically valid?

Personalising advice to a person’s diet, culture, health and goals can be useful. The added value of genotype-based advice is less established and depends on the variant, outcome and quality of evidence.

Should I buy a DNA nutrition test?

Treat it as limited information rather than a prescription. Consider privacy, evidence, interpretation and whether the result would change care. Discuss medically important findings with an appropriately qualified professional.

Final Thoughts

Genes help explain why sensory experiences differ, but they do not reduce a person to a ‘taster type’ or predict a lifetime of cravings. The same variant can operate differently across foods, people and environments.

The strongest form of personalisation is often practical: understand what you perceive, work with foods you can access and enjoy, expand variety gradually, and use clinical advice when health—not preference—is the issue.