What's The Best Diet To Live a Healthy Life?

It's Sunday, August twenty third. My cousins are obsessed with protein. Every conversation about fitness turns into "you need more protein, you need chicken, you can't be fit and be vegetarian." And I get why they think that, because honestly, I can't name a single vegetarian athlete off the top of my head. Maybe some cricketer in India, but in the NFL, the NBA, wrestling, it feels like every elite athlete eats meat. My brother and I both grew up vegetarian, and growing up I never really questioned it, but when I hear my cousins talk about protein like it's the only thing that matters, I start wondering if the data actually supports what they're saying or if they've just absorbed the same messaging that everyone else has. So I looked at what the largest dietary studies actually say about vegetarians versus meat eaters, and the answer turned out to be different from what either side usually argues. This was the first thing I wanted to answer because it's the core of what my cousins believe: you can't be strong or athletic on a vegetarian diet. The research says otherwise, and it's not even close to ambiguous.

Multiple clinical trials have compared muscle growth between people eating plant-based protein and people eating animal-based protein, and when total protein intake is matched, the results are identical. A 2021 study put young men on either plant-based or animal-based high-protein diets with resistance training, and both groups gained the same amount of lean muscle mass over the study period. A 2024 modeling study published in Nutrients looked specifically at NFL players and found that completely plant-based diets, scaled to meet their caloric needs, provided enough protein and all essential amino acids for maximal muscle mass and athletic performance.

And the list of elite athletes eating plant-based diets is longer than I expected: Chris Paul in the NBA, Venus Williams in tennis, Kyrie Irving, and an NFL defensive end named Deatrich Wise Jr. who bet his team nutritionists that he wouldn't lose muscle after going vegan and won the bet. Half the Tennessee Titans reportedly went plant-based to improve recovery and energy. Messi eats a largely vegan diet during the season on the advice of his nutritionist. The idea that you can't perform at the highest level without meat just doesn't hold up when you look at who's actually doing it.

The catch is that plant protein is slightly less digestible than animal protein, so vegetarian and vegan athletes are generally advised to eat about 10 to 20 percent more total protein than their meat-eating counterparts to compensate. And I want to be honest about the practical side of this, because my cousins aren't entirely wrong about how hard it is. The general guideline for building muscle is roughly 0.7 to 1 gram of protein per pound of body weight per day. If you weigh 180 pounds, that's somewhere around 130 to 180 grams of protein daily. A chicken breast gives you about 31 grams of protein in 165 calories. Getting the same amount from lentils takes over 400 calories. So while the science says plant protein and animal protein build the same amount of muscle when intake is matched, actually matching that intake on a plant-based diet requires a lot more planning, a lot more volume of food, and a lot more effort than just grilling a couple chicken breasts. The science is on the vegetarians' side. The convenience is on the meat eaters' side, and for most people, convenience wins. The World Health Organization's International Agency for Research on Cancer classifies processed meat, things like bacon, sausage, hot dogs, and deli meats, as a Group 1 carcinogen. That's the same category as cigarettes and asbestos. Unprocessed red meat like steak and ground beef is classified as Group 2A, which means "probably carcinogenic." That distinction between processed and unprocessed matters a lot more than most people realize, because the health risks associated with eating a steak are significantly lower than the risks associated with eating the same amount of calories in bacon or salami.

A study published just this week followed nearly a million people over 38 years and found that people who ate the least red and processed meat had about 4 percent lower risk of dying from all causes, including heart disease, cancer, and stroke, compared to people who ate the most. But when they broke it down further, the picture got more specific: people who ate only white meat, chicken and fish, had outcomes that were comparable to or better than vegetarians on several measures, and both groups were significantly healthier than the high red and processed meat group. The gap between "eats chicken and fish" and "eats no meat at all" was small. The gap between "eats processed meat regularly" and "doesn't" was large.

This is the part that gets lost in the vegetarian versus meat eater debate: the conversation is framed as meat versus no meat, when the data says the more useful distinction is processed meat versus everything else. A large meta-analysis that reviewed 96 studies found slight reductions in heart disease and cancer risk among vegetarians compared to omnivores, but no difference in overall mortality. When the researchers dug into why, the answer wasn't really about the meat: vegetarians tend to exercise more, smoke less, drink less alcohol, eat more fruits and vegetables, and maintain healthier body weights than the general population. A German cohort study found that both vegetarians AND health-conscious non-vegetarians had significantly lower mortality than the general population, which suggests that a big chunk of the "vegetarian advantage" comes from the overall lifestyle rather than the absence of meat specifically.

The Seventh-day Adventist studies at Loma Linda University, which have been running for decades and are some of the best data we have on this question, compared Adventists who eat meat to those who don't. Both groups live significantly longer than the average American, but the vegetarian Adventists live about 4 to 5 years longer on average. The catch is that Seventh-day Adventists as a group don't smoke, rarely drink, exercise regularly, and prioritize community and rest, so separating the effect of not eating meat from the effect of everything else they do is really difficult.

What the research keeps coming back to is that a health-conscious person who eats moderate amounts of chicken, fish, and unprocessed red meat, along with lots of vegetables, whole grains, and healthy fats, has health outcomes that are very similar to a vegetarian eating a balanced diet. The advantage of vegetarianism in the data is mostly the advantage of the kind of person who chooses to be vegetarian, not the absence of meat itself. If the question is "what should I eat to live the longest and healthiest life," the research points in a direction that's less dramatic than either camp usually argues.

The Mediterranean diet, which includes moderate amounts of fish, poultry, olive oil, nuts, whole grains, and lots of vegetables with limited red meat and almost no processed meat, consistently performs at or near the top of every large-scale dietary study. It's associated with lower rates of heart disease, cancer, diabetes, and overall mortality, and it's not vegetarian. It just doesn't include a lot of the stuff that drives the worst health outcomes.

Processed meat is the clearest negative signal in the data. Reducing or eliminating bacon, sausage, hot dogs, and deli meats has a more measurable impact on long-term health than eliminating meat entirely. Unprocessed red meat in moderate amounts, a few servings per week rather than daily, doesn't carry the same risk profile as processed meat, though the research suggests less is still better than more. Chicken and fish appear to be largely neutral to positive from a health perspective, with fish carrying additional benefits from omega-3 fatty acids.

And keto, since a lot of people ask about it: short-term studies show benefits for weight loss and blood sugar control, but long-term data is limited and some researchers have raised concerns about cardiovascular risk from diets that are very high in saturated fat over many years. The honest answer on keto is that we don't have enough long-term evidence to know whether it's sustainable as a permanent way of eating, and most of the strongest dietary studies with decades of follow-up involve diets that include carbohydrates.

The boring truth about nutrition is that it mostly comes down to patterns rather than single foods: eat mostly plants, include lean protein from whatever source you prefer, minimize processed food, and don't overeat. That advice hasn't changed meaningfully in decades despite an entire industry trying to convince you that it has. The debate between vegetarian and meat eater turns out to be a lot less interesting than I expected, because the data keeps pointing to the same place: it's not about whether you eat meat, it's about what kind and how much. Processed meat is the clearest risk. Everything else is a spectrum where the differences are smaller than the marketing suggests.

Stay informed, stay curious, and we'll see you tomorrow.