Do you live longer on a vegetarian or plant-based diet?
A good-quality plant-based diet is linked to fewer early deaths. But strictly vegetarian or vegan eating has not been proven to be better than a varied diet that includes occasional meat or fish.
A healthy plant-based way of eating is linked to a lower chance of dying early. Older Chinese people who ate the most fresh plant foods, think fruit, vegetables, legumes, nuts and tea, were 19% less likely to die than those who ate the least. Vegetarians also show a lower risk of dying from heart and blood vessel disease across many studies, probably because of lower cholesterol, a healthier weight and more antioxidants in their diet.
Yet the picture is more nuanced than 'plant-based always wins'. When vegetarians are compared with health-conscious non-vegetarians who eat meat occasionally, the difference in deaths from most cancers and stroke disappears. A healthy lifestyle in general therefore matters more than simply cutting out meat. A recent study combining many findings also found no clear advantage of fully vegetarian eating over a mostly plant-based diet that includes some meat. Of the well-known regions famous for having unusually high numbers of people who reach a hundred, only one has a population that eats predominantly vegetarian.
The quality of your plant-based food turns out to be decisive, not simply the quantity. A plant-based diet high in preserved vegetables and sugar was actually linked to 17% higher risk of death. Fresh and unprocessed protects; processed and sweetened does not. This distinction carries more weight than the label 'vegetarian'.
Among vegans, overall death rates in available studies are similar to those of vegetarians and of people who eat meat occasionally. Among people over eighty in China, a vegetarian or vegan diet was even linked to a smaller chance of reaching a hundred, particularly in people who were underweight. At an advanced age, a varied diet containing both animal and plant foods appears to be better for an exceptionally long life.
For some groups, a strictly vegan diet carries real risks. Shortfalls in vitamin B12, vitamin D, omega-3 fatty acids, iron, calcium and zinc have been reported in children, pregnant women and older adults. Supplements are essential for these groups. That is not a reason to avoid plant-based eating, but it is a reason to pay close attention.
All studies track people's habits over time and show links, but cannot prove cause and effect. The groups studied vary considerably: China, Europe and North America. Studies in which people were randomly assigned to a diet and then followed to see how long they lived do not exist.
Do you live longer by eating less protein, or more?
The ideal protein level differs by stage of life: in middle age less appears to be better, while after the age of 65 getting enough protein is protective. What is clear: choose plant-based protein sources as much as possible and limit processed red meat.
Does the Mediterranean diet help you live longer?
People who closely follow the Mediterranean diet die prematurely less often on average, although a cause-and-effect relationship has not yet been definitively proven. The strongest signal is seen in older adults and in deaths from heart and blood vessel disease, and the diet is in any case safe and broadly applicable.
Does eating less help you live longer?
In laboratory animals the effect on lifespan is well established, but in healthy humans direct evidence is lacking. A moderate and sustainable eating pattern is wiser than extreme restriction; discuss major changes to your diet with a dietitian or doctor.
Do you actually live longer if you structurally eat fewer calories?
In laboratory animals, eating less convincingly extends lifespan, but this has not yet been demonstrated for healthy people without excess weight. If you want to benefit from what has been shown, eating moderately less or following an interrupted eating pattern are the safest, most reasonably supported options.
Is a low-carb or keto diet good for a longer life?
Research shows that a plant-based low-carb diet is associated with a lower risk of dying early. That association disappears when carbohydrates are replaced with meat and animal fats.
Is eating organic food really healthier?
Eating organic demonstrably leads to lower pesticide exposure and less contact with antibiotic-resistant bacteria through meat. Whether this translates into less disease in the long run remains unclear.