....By the way, in our evolution as a species, when has there ever been a large vegan culture / population? Where is there a vegan Blue Zone culture? Say what you will, but the surprising lack of vegan centenarians should speak volumes about your chosen way of life.
Though many cultures eat mostly plant based food, as in less than 10% animal products, I think its hard to argue that a 100% vegan diet is the natural diet- extreme diets are not all that practical except maybe in wealthy societies. Also less than 1% of the population currently eats purely vegan. This means there is a lack of large scale research verifying whether the apparent reductions in many aging markers and disease risk translate into longevity. However its not unreasonable to hypothesize, that if a diet improves numerous markers of aging as well as reduces rates of major killer diseases such as cancer and heart disease, that it could increase lifespan.
Many Blue Zone cultures, and countries with very long life expectancies (such as Sweden, Iceland), consume high fat diets rich in animal foods. Furthermore, most of the studies on vegan / vegetarian life expectancies show little difference in life expectancy than a standard western diet.
Consider the following:
Mortality in vegetarians and nonvegetarians: detailed findings from a collaborative analysis of 5 prospective studies.
We combined data from 5 prospective studies to compare the death rates from common diseases of vegetarians with those of nonvegetarians with similar lifestyles. A summary of these results was reported previously; we report here more details of the findings. Data for 76172 men and women were available. Vegetarians were those who did not eat any meat or fish (n = 27808). Death rate ratios at ages 16-89 y were calculated by Poisson regression and all results were adjusted for age, sex, and smoking status. A random-effects model was used to calculate pooled estimates of effect for all studies combined. There were 8330 deaths after a mean of 10.6 y of follow-up. Mortality from ischemic heart disease was 24% lower in vegetarians than in nonvegetarians (death rate ratio: 0.76; 95% CI: 0.62, 0.94; P<0.01). The lower mortality from ischemic heart disease among vegetarians was greater at younger ages and was restricted to those who had followed their current diet for >5 y. Further categorization of diets showed that, in comparison with regular meat eaters, mortality from ischemic heart disease was 20% lower in occasional meat eaters, 34% lower in people who ate fish but not meat, 34% lower in lactoovovegetarians, and 26% lower in vegans. There were no significant differences between vegetarians and nonvegetarians in mortality from cerebrovascular disease, stomach cancer, colorectal cancer, lung cancer, breast cancer, prostate cancer, or all other causes combined.
Mortality in British vegetarians: results from the European Prospective Investigation into Cancer and Nutrition (EPIC-Oxford).
BACKGROUND: Few prospective studies have examined the mortality of vegetarians. OBJECTIVE: We present results on mortality among vegetarians and nonvegetarians in the European Prospective Investigation into Cancer and Nutrition (EPIC-Oxford). DESIGN: We used a prospective study of men and women recruited throughout the United Kingdom in the 1990s. RESULTS: Among 64,234 participants aged 20-89 y for whom diet group was known, 2965 had died before age 90 by 30 June 2007. The death rates of participants are much lower than average for the United Kingdom. The standardized mortality ratio for all causes of death was 52% (95% CI: 50%, 54%) and was identical in vegetarians and in nonvegetarians. Comparing vegetarians with meat eaters among the 47,254 participants who had no prevalent cardiovascular disease or malignant cancer at recruitment, the death rate ratios adjusted for age, sex, smoking, and alcohol consumption were 0.81 (95% CI: 0.57, 1.16) for ischemic heart disease and 1.03 (95% CI: 0.90, 1.16) for all causes of death. CONCLUSIONS: The mortality of both the vegetarians and the nonvegetarians in this study is low compared with national rates. Within the study, mortality from circulatory diseases and all causes is not significantly different between vegetarians and meat eaters, but the study is not large enough to exclude small or moderate differences for specific causes of death, and more research on this topic is required.
What do they mean, the study is not large enough, with 47,254 participants?
As a niche group, vegans / vegetarians tend to be more health conscious than your regular omnivore.
In fact, vegan / vegetarian diets actually accelerate certain markers of aging like glycation.
Plasma levels of advanced glycation end products in healthy, long-term vegetarians and subjects on a western mixed diet "
Conclusion Enhanced plasma AGE levels in vegetarians in comparison to omnivores are herein presented for the first time. Mechanisms of AGE elevation and potential pathophysiological relevance of this finding are to be elucidated in prospective studies."
Advanced glycation end products and nutrition. "Advanced glycation end products (AGEs) may play an important adverse role in process of atherosclerosis, diabetes, aging and chronic renal failure. Levels of N(epsilon)-carboxymethyllysine and fluorescent AGE values were estimated in two nutritional population groups--alternative group (vegetarians--plant food, milk products, eggs) and traditional group (omnivorous subjects). Vegetarians have a significantly higher carboxymethyllysine content in plasma and fluorescent AGE values. Intake of proteins, lysine and monosaccharides as well as culinary treatment, consumption of food AGEs (mainly from technologically processed products) and the routes of Maillard reaction in organism are the substantial sources of plasma AGEs. Vegetarians consume less proteins and saccharides. Lysine intake is significantly reduced (low content in plant proteins). Subjects on alternative nutrition do not use high temperature for culinary treatment and consume low amount of technologically processed food. Fructation induced AGE fluorescence is greater as compared with that induced by glucose. It is due to higher participation of a more reactive acyclic form of fructose. Intake of vegetables and fruit with predominance of fructose is significantly higher in vegetarians.
Comparison of nutrition and plasma AGEs in vegetarian and omnivorous groups shows that the higher intake of fructose in alternative nutrition of healthy subjects may cause an increase of AGE levels."
Where as actually consuming meat might reduce this marker of aging:
Would Carnosine or a Carnivorous Diet Help Suppress Aging and Associated Pathologies? "ABSTRACT: Carnosine (-alanyl-L-histidine) is found exclusively in an- imal tissues. Carnosine has the potential to suppress many of the bio- chemical changes (e.g., protein oxidation, glycation, AGE formation, and cross-linking) that accompany aging and associated pathologies. Glyca- tion, generation of advanced glycosylation end-products (AGEs), and formation of protein carbonyl groups play important roles in aging, di- abetes, its secondary complications, and neurodegenerative conditions. Due to carnosine’s antiglycating activity, reactivity toward deleterious carbonyls, zinc- and copper-chelating activity and low toxicity, carno- sine and related structures could be effective against age-related protein carbonyl stress. It is suggested that carnivorous diets could be benef icial because of their carnosine content, as the dipeptide has been shown to suppress some diabetic complications in mice. It is also suggested that carnosine’s therapeutic potential should be explored with respect to neu- rodegeneration. Olfactory tissue is normally enriched in carnosine, but olfactory dysfunction is frequently associated with neurodegeneration. Olfactory administration of carnosine could provide a direct route to compromised tissue, avoiding serum carnosinases."
Glycation, ageing and carnosine: Are carnivorous diets beneficial?"Non-enzymic protein glycosylation (glycation) plays important roles in ageing and in diabetes and its secondary complications. Dietary constituents may play important roles in accelerating or suppressing glycation. It is suggested that carnivorous diets contain a potential anti-glycating agent, carnosine (β-alanyl-histidine), whilst vegetarians may lack intake of the dipeptide. The possible beneficial effects of carnosine and related structures on protein carbonyl stress, AGE formation, secondary diabetic complications and age-related neuropathology are discussed."
And for your inflammation markers, they are much lower on a low-carb, high fat diet containing meat:
Comparison of Low Fat and Low Carbohydrate Diets on Circulating Fatty Acid Composition and Markers of Inflammation "In summary, a very low carbohydrate diet resulted in profound alterations in fatty acid composition and reduced inflammation compared to a low fat diet."
I think I'll take my chances with some meat consumption, thank you