What Is Precision Nutrition?
A plain-language definition of precision nutrition, how it differs from personalized and general nutrition advice, what inputs it uses, and what the evidence shows so far.
Content last updated . This page has not been medically reviewed.
Evidence labels used in this library are explained in How We Label Evidence in Specialty Topics.
Words that get mixed up
There is no agreed definition of personalised nutrition. [1] One widely cited review defines it as an approach that uses information on individual characteristics to develop targeted nutritional advice, products or services. [1] The same review sorts the related terms like this:| Term | Plain meaning |
|---|---|
| Stratified or tailored nutrition | Group people who share characteristics and give each group matching advice. [1] |
| Personalised nutrition | Try to fit advice to each individual. [1] |
| Precision nutrition | The most ambitious label. It assumes we understand the links between a person, their food and their health well enough to offer advice known to benefit that person. [1] |
| Nutrigenetics | Study of how people with different genes respond differently to a specific diet. [1] |
The authors add that the scientific certainty needed for precision nutrition is much greater than for the other approaches. [1] So the name describes a goal. It does not tell you that the goal has been reached.
What goes into it
Researchers have tried several kinds of personal information. Each has its own guide in this library:- Genes: see Genetics as a Nutrition Input and DNA-Based Diets.
- Blood sugar readings: see Glucose Monitoring as a Nutrition Input.
- Blood tests: see Blood Biomarkers as a Nutrition Input.
- Gut microbiome data: see Microbiome Data as a Nutrition Input.
- What a person reports eating: see Dietary Records and Self-Report Error as Inputs.
Personalising can also mean fitting advice to a person's habits, preferences and obstacles, not only to biology. [1]
What the evidence shows so far
Evidence level: promising but limited for some uses, insufficient evidence for others. Keep these apart:- Different people respond differently to identical meals. In a study of 800 people wearing glucose sensors for a week, the researchers measured responses to 46,898 meals and found high variability in the response to identical meals. [2] This is a measurement of a short-term blood sugar rise. It is not proof that one person's long-term health depends on it.
- Personal advice can change what people eat. A systematic review of 11 randomized trials in healthy adults found that dietary intake improved more with personalized advice than with generalized advice. [3] Its authors called for more well-designed trials comparing different kinds of personalization. [3]
- Genes have not been shown to pick the better diet. In a 12-month trial of 609 adults, neither a genotype pattern nor insulin secretion identified which of two weight-loss diets worked better for whom. [4]
- Some products run ahead of the science. The BMJ review notes that commercial offerings in this area are often based on direct-to-consumer tests that are unregulated and have limited published evidence of benefit. [1]
Population advice still applies
General guidance has not been replaced. The World Health Organization says healthy diets come in many forms, and that adequacy, balance, moderation and diversity should be the foundation. [5] For everyday food guidance, see Food-First Nutrition and Eating Patterns Compared. For how general and personal advice compare, see Personalized vs Population-Level Nutrition Advice.Who should be careful
Do not use test results or app scores to cut out food groups or to restrict eating sharply. This matters most for children, pregnancy, older adults, people with diabetes or kidney disease, people taking medicines that affect blood sugar, and anyone with a history of disordered eating. See Restrictive-Diet Risks From Personalized Results and Eating Disorders and Disordered Eating. Talk with a doctor or a registered dietitian about results that worry you.Frequently asked questions
Is precision nutrition the same as personalized nutrition?
Not exactly. Reviewers use "precision" for the most ambitious version, which would need enough knowledge to give advice known to benefit the individual. [1] Many products use the words loosely.
Is precision nutrition an approved or proven treatment?
No. It is a research field. A direct-to-consumer test for general wellness is generally not reviewed by the US FDA before it is offered. [6]
Does a personal plan work better than general advice?
For changing what people eat, a review of 11 trials found an advantage for personalized advice. [3] Those trials measured what people ate and followed them for between 1 and 12 months, so they do not show long-term health benefits. [3]
Can my genes tell me the best diet?
In a large weight-loss trial, the genotype patterns tested did not identify the better diet for a person. [4]
References
- Ordovas JM, Ferguson LR, Tai ES, Mathers JC. Personalised nutrition and health. BMJ 2018. PubMed 29898881 (full text PMC6081996). Read 2026-10-22.
- Zeevi D, Korem T, Zmora N, et al. Personalized nutrition by prediction of glycemic responses. Cell 2015. PubMed 26590418. Read 2026-10-22.
- Jinnette R, Narita A, Manning B, et al. Does personalized nutrition advice improve dietary intake in healthy adults? A systematic review of randomized controlled trials. Adv Nutr 2021. PubMed 33313795. Read 2026-10-22.
- Gardner CD, Trepanowski JF, Del Gobbo LC, et al. Effect of low-fat vs low-carbohydrate diet on 12-month weight loss in overweight adults and the association with genotype pattern or insulin secretion: the DIETFITS randomized clinical trial. JAMA 2018. PubMed 29466592. Read 2026-10-22.
- World Health Organization, Healthy diet fact sheet (page dated 26 January 2026). Read 2026-10-22.
- US FDA, Direct-to-Consumer Tests. Read 2026-10-22.