New research following more than 5,000 Chinese adults aged 80 and older found that strict avoidance of meat in the oldest age groups was associated with a lower chance of making it to 100, while those who included small amounts of animal-sourced foods often fared better. The study highlights how nutrition priorities change late in life, and suggests underweight older adults who skip animal proteins may be at higher risk of frailty and shortened survival. Observational limits mean the findings show association, not cause, but they sharpen a practical point about protein, bone health and real-world eating in the ninth and tenth decades.
Researchers used data from the Chinese Longitudinal Healthy Longevity Survey collected between 1998 and 2018 to track survival to age 100. Participants who reported not eating meat were less likely to reach their 100th birthday than those who ate animal products regularly. The difference was most pronounced among people classified as underweight.
These results seem to run against decades of studies linking plant-forward diets to lower risk of heart disease, stroke, diabetes and obesity in younger adults. Much of the evidence for plant-based benefits comes from populations decades younger than those in this study, where the health priorities are different. In advanced age the balance often tips toward preserving muscle and preventing fractures rather than reducing long-term chronic disease risk.
“The headline ‘vegetarians over 80 less likely to reach 100’ sounds surprising, because it contrasts with decades of data linking plant‑forward diets to lower chronic disease risk earlier in life,” Erin Palinski-Wade, a New Jersey-based registered dietitian, told Fox News Digital. Her point underscores that age and body composition change how we interpret dietary patterns.
Physiological shifts matter: older adults commonly lose muscle mass and bone density, and appetite often declines, making it harder to meet protein and micronutrient needs from plants alone. The study authors emphasize that these age-related losses can increase the risk of malnutrition, frailty and falls. That context helps explain why strict avoidance of animal protein could be problematic for some people in their 80s and 90s.
The lower longevity among vegetarians was observed primarily in those who were underweight, suggesting body mass itself is a key factor. Being underweight is already linked to higher frailty and mortality, which complicates efforts to tease out diet effects from weight-related risks. When people maintained a healthy weight, the association between meat avoidance and lower odds of reaching 100 disappeared.
Importantly, the shortened lifespans were not seen in older adults who continued to include non-meat animal products such as fish, eggs and dairy in their diets. Those eating these items appeared just as likely to live to 100 as regular meat eaters, likely because fish, eggs and dairy provide nutrients that support muscle and bone. The study suggests flexibility in sourcing animal protein may be enough to offset risks tied to strict vegan patterns late in life.
“This is an observational study, so it can only show associations, and does not prove that avoiding meat directly reduces the odds of reaching 100,” Palinski-Wade added. Observational work can point to trends, but it cannot establish direct cause-and-effect relationships or rule out other contributing factors.
The researchers and nutritionists recommend that adults in their 80s and beyond focus on maintaining a healthy weight and securing adequate protein and micronutrients. “For adults in their 80s and beyond, especially anyone losing weight or muscle, the priority should be maintaining a healthy weight and meeting protein and micronutrient needs — even if that means adding or increasing fish, eggs, dairy or well‑planned, fortified plant proteins and supplements.” Careful monitoring by a clinician or dietitian can help spot shortfalls in B12, vitamin D, calcium and total protein when diets are restrictive.
“Younger and healthier adults can still confidently use plant‑forward or vegetarian patterns to lower long‑term chronic disease risk,” she added. The takeaway is practical: tailor diet strategy to the life stage, body weight and individual health needs, and consider modest inclusions of animal-sourced foods for those at risk of weight loss or muscle decline rather than insisting on a one-size-fits-all approach.
