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Treatment & Procedure

Prevention, Epigenetics & Genetics

Focus topic

You cannot change your genes. How they are read, however, can be influenced. That is the idea behind epigenetics in prevention. The research on it is real and exciting, but as a personal measuring instrument it is still young.

In short

Prevention services using genetics and epigenetics aim to derive a personal risk profile and a biological age from gene and methylation patterns. It is well established that lifestyle matters a great deal: people who meet five simple health factors live considerably longer in large cohorts. Epigenetic clocks measure aging processes and predict mortality in studies, and in a large randomized trial calorie restriction slowed the measured pace of aging. For the individual, however, the tests are imprecise, and it has not been shown that a better value prevents disease.

What epigenetics is

Epigenetics describes chemical marks on the DNA, above all methyl groups, that help determine which genes are active in a cell. The gene sequence stays the same, but the pattern of marks changes with age and responds to smoking, diet, physical activity and stress.

Epigenetic clocks can be calculated from these patterns. The first well-known clock from 2013 estimates age from 353 sites in the genome and was developed on 8,000 samples. Newer clocks such as GrimAge were trained to predict mortality; others such as DunedinPACE measure how fast someone is aging right now.

What a prevention service includes

Typically it is a combination of a detailed consultation, family history, lab values and, where appropriate, genetic or epigenetic tests, from which a personal strategy is derived. The basis is available as a service covered by statutory health insurance: the statutory check-up includes medical history, physical examination, blood pressure, vaccination status and counseling, and from age 35 also blood sugar, cholesterol and urine.

Reputable services draw a clear line between medically justified genetics, for example when cancer or heart disease runs in the family, and lifestyle tests. They explain how precisely a test measures, do not sell supplements to match the result, and put the measures that work anyway in the foreground.

What is well supported

The strongest lever is unspectacular. A 2018 analysis of two large American cohorts with up to 34 years of follow-up found: people who never smoke, are of normal weight, are active for at least 30 minutes a day, drink little alcohol and eat well have a projected life expectancy at age 50 that is 14.0 years (women) or 12.2 years (men) longer than someone who meets none of these factors.

Epigenetics also delivers real findings. In large data sets, GrimAge predicts death, coronary heart disease and cancer better than older clocks. And in the randomized CALERIE trial, two years of calorie restriction slowed the pace of aging measured with DunedinPACE. This is the best evidence so far that biological aging can be measurably slowed through behavior.

What the studies show

Calorie restriction and pace of aging, CALERIE 2023

Waziry and colleagues analyzed blood samples from 220 adults without obesity who for 2 years ate either 25 percent fewer calories or freely. DunedinPACE showed a slower pace of aging; PhenoAge and GrimAge did not change significantly. The effects were small, and the analysis was not planned in advance as the primary objective.

Eight weeks of lifestyle program, pilot study 2021

Fitzgerald and colleagues randomized 43 healthy men aged 50 to 72 to an 8-week program of diet, sleep, exercise and relaxation, supplemented with probiotics and plant compounds, or to no intervention. Afterwards, epigenetic age was 3.23 years below that of the control group. Within the program group it fell by 1.96 years, which was not statistically significant.

How reliably the clocks measure, 2022

Higgins-Chen and colleagues measured the same samples several times. With six widely used clocks, the results differed from one another by up to 9 years from technical noise alone. With an improved calculation method, most repeat measurements were within 1.5 years.

Where the data stop

For the individual, an epigenetic age is currently a rough value. If repeat measurements of the same sample can differ by several years, an improvement of one or two years after a program can hardly be distinguished from measurement noise. The clocks also respond differently: in CALERIE one moved, two others did not.

Above all, the decisive proof is missing. No study has yet shown that someone whose epigenetic age falls is therefore less often ill or lives longer; the CALERIE authors themselves call for studies with long follow-up for this. The same applies to genetics: a 2016 meta-analysis of 18 studies found that communicating a DNA-based disease risk changes neither smoking nor diet nor physical activity. Whether counseling based on methylation tests leads to better outcomes than good standard counseling has not been studied.

Status, approval and legal

The health check-up is covered by statutory health insurance: once between ages 18 and 34, every three years from age 35, and from 35 also once with a test for hepatitis B and C. Epigenetic age tests and lifestyle gene panels are not covered by statutory health insurance and are paid for privately. Genetic testing is regulated by the German Genetic Diagnostics Act (Gendiagnostikgesetz): before and after a predictive genetic test, genetic counseling by a physician is mandatory, which can only be waived in writing.

Safety

There are hardly any physical risks; a blood or saliva sample is usually enough. The risks lie in the interpretation: a poor value can cause unnecessary worry, a good one can give false reassurance and tempt people to neglect screening examinations. The 2016 meta-analysis did, however, find no increase in anxiety or depression after genetic risks were communicated. Genetic and epigenetic data deserve particular protection; it is worth asking where they are stored and whether they are passed on.

Frequently asked questions about prevention, epigenetics & genetics

What is an epigenetic test?

It measures methylation patterns on the DNA, usually from blood or saliva, and uses them to calculate, for example, a biological age or a pace of aging. The gene sequence itself is not examined.

How accurate is an epigenetic age test?

Good for studies with many people, limited for the individual. With widely used clocks, repeat measurements of the same sample differed by up to 9 years. Newer calculation methods reduce this noise considerably.

Can biological age be lowered?

In studies, yes, to a small extent. In a large randomized trial, two years of calorie restriction slowed the pace of aging; a small pilot study found a lower epigenetic age after an 8-week lifestyle program. Whether this prevents disease has not been shown.

Does health insurance pay for epigenetic tests?

No, epigenetic age tests and lifestyle gene panels are self-pay services. The statutory check-up, by contrast, is covered by statutory health insurance, every three years from age 35.

Does a gene test change my health behavior?

According to a meta-analysis of 18 studies, mostly not. Communicating a genetic risk did not measurably change smoking, diet or physical activity.

What does the most for a long life?

The familiar basics: not smoking, normal weight, daily physical activity, little alcohol and a good diet. People who meet all five have, in large cohorts, a projected life expectancy at age 50 that is 14.0 years (women) or 12.2 years (men) longer than someone who meets none.

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Information only, not medical advice and not a usage or dosage recommendation. Prescription-only and unapproved substances belong in the hands of a physician. Last updated: 2026-09-30.