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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteShort answer: A Chinese study found that vegetarian participants aged 80 or older were less likely than omnivores to be centenarians, particularly when they were underweight. That does not show that meat causes longevity. A separate 2026 UK Biobank analysis instead associated low-meat, fish-eating and vegetarian diets with slower biological aging.
What the centenarian study actually found
The headline comes from a nested case-control study of Chinese adults who had already reached at least age 80. Researchers compared 1,459 centenarians with 3,744 noncentenarian controls and examined their reported dietary patterns.
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Vegetarian participants had a lower likelihood of being centenarians than omnivores in the analysis. The association was most relevant among participants who were underweight. In other words, the apparent difference was not uniform across every older adult or every body-weight category.
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Because everyone in the analysis was already 80 or older, the result addresses a conditional question: among people who reached advanced old age, which dietary group was more common among those who reached 100? It does not establish that the same relationship applies to younger adults, nor does it measure the effect of eating meat throughout an entire lifetime.
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Why body weight matters
Underweight status can indicate inadequate energy intake, illness, frailty or loss of muscle in later life. The study’s stronger association in underweight participants therefore points to nutritional adequacy as an important context. It does not demonstrate that adding meat alone reverses underweight or extends life.
The central catch: this is an association, not a cause-and-effect test
The design compared existing dietary groups rather than randomly assigning people to eat meat or avoid it. That leaves several possible explanations for the observed difference. People who follow different diets can differ in health status, income, education, access to care, activity, smoking, lifelong food availability and reasons for changing what they eat. Older adults may also alter their diet after illness, creating reverse causation.
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The result is therefore evidence about a pattern in this particular population, not proof that meat improves survival. It cannot justify a universal instruction for vegetarians to start eating meat or a claim that omnivores are guaranteed to live longer.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchA newer UK Biobank study points in a different direction
A 2026 Clinical Nutrition analysis by Chuan-Rui Zeng and colleagues used UK Biobank data from 407,376 participants at baseline and 8,855 participants at the first follow-up. The publication record is dated 24 February 2026.
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Participants were classified as regular meat-eaters, low-meat eaters, fish-eaters or vegetarians. The researchers examined KDM biological-age acceleration, a measure of whether a person’s physiological markers indicate faster or slower aging than expected for their chronological age.
In the fully adjusted model, every non-regular-meat group had a lower biological-age acceleration value than regular meat-eaters. Fish-eaters had the largest reduction, followed by vegetarians and low-meat eaters:
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| Diet group | Beta for KDM biological-age acceleration | 95% confidence interval | Comparison |
|---|---|---|---|
| Fish-eaters | -2.47 | -2.71 to -2.23 | Versus regular meat-eaters |
| Vegetarians | -2.34 | -2.61 to -2.07 | Versus regular meat-eaters |
| Low-meat eaters | -0.61 | -0.68 to -0.54 | Versus regular meat-eaters |
The follow-up analysis also reported that people adhering to low-meat, pescatarian or vegetarian diets experienced a significantly slower increase in biological-age acceleration than consistent regular meat-eaters. The study’s abstract summarizes the finding this way: “Plant-based (with or without fish) and low-meat dietary patterns are associated with slower biological aging compared with regular-meat diet.”
Why the two studies do not actually contradict each other
They ask different questions, use different populations and measure different outcomes.
| Feature | Chinese centenarian study | UK Biobank study |
|---|---|---|
| Population and age | Chinese adults aged 80 or older; 1,459 centenarians and 3,744 controls | UK Biobank participants; 407,376 at baseline and 8,855 at first follow-up |
| Diet categories | Vegetarian compared with omnivore | Regular meat, low meat, fish-eating and vegetarian |
| Outcome | Being a centenarian, meaning reaching age 100 | KDM biological-age acceleration and its change over follow-up |
| Design | Nested case-control comparison | Baseline analysis plus a longitudinal follow-up analysis |
| Adjustment details | Specific adjustment variables are not stated in the available summary | Fully adjusted model; the available summary does not list every covariate |
| What can be concluded | An association within an already-old Chinese population | An association between dietary pattern and biological-aging measures in a UK cohort |
Reaching 100 is a hard survival endpoint. Biological-age acceleration is an indirect, laboratory-derived measure. A diet can be associated with one without producing the other, and neither study is a randomized trial.
What older adults should do with the evidence
Do not change to an omnivorous diet solely because of the centenarian headline. Likewise, the UK findings do not prove that eliminating meat will extend an individual’s life. The practical priority is a diet that supplies enough energy, protein and essential nutrients while fitting a person’s medical needs, preferences and ability to eat.
- If an older adult is losing weight, underweight, weak or experiencing reduced appetite, arrange a medical assessment rather than relying on a headline about meat.
- Vegetarian and vegan diets require deliberate planning for protein and other nutrients; an appropriately qualified clinician or registered dietitian can identify gaps.
- Anyone considering a major dietary change should account for kidney disease, diabetes, swallowing problems, medication interactions and other diagnosed conditions.
- Stable weight, muscle function and overall health context are more informative than classifying a diet as simply “meat” or “vegetarian.”
What the headline really means
The Chinese study found that, among people already aged 80 or more, vegetarians were less likely than omnivores to appear in the centenarian group, with the clearest association among underweight participants. That is not evidence that meat is a longevity treatment. The newer UK analysis found slower biological aging among low-meat, fish-eating and vegetarian participants, showing why diet headlines must be interpreted alongside age, body weight, outcome definition and study design.
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