Paleo vs Vegan: Rules, Nutrient Gaps and the Evidence

By Paleo Life Coach Editorial Team · Last updated October 5, 2026 · Checked against the Academy of Nutrition and Dietetics, NHS and MedlinePlus guidance and the original studies

Paleo and vegan look like opposite ends of the eating spectrum. One builds meals around meat, fish and eggs; the other removes every animal product. Yet both cut out most processed food and push vegetables and fruit, and people often weigh one against the other when they decide to change how they eat. This comparison of paleo vs vegan goes past the usual pros-and-cons list: it lines up the actual food rules, shows what each diet tends to run short on, costs out protein in calories, and summarizes what studies of real eaters found.

The quick version: Paleo removes grains, legumes, dairy and refined sugar but keeps meat, fish and eggs; vegan removes all animal foods but keeps grains and legumes. A well-planned vegan diet has stronger long-term evidence and a far lower carbon footprint, but needs vitamin B12. Paleo is higher in protein and B12 but lower in fiber and calcium.

What is the difference between paleo and vegan?

The core difference is animal foods versus grains and legumes. The paleo diet is modeled on what hunter-gatherers ate before farming, so it drops foods that arrived with agriculture: grains, beans and lentils, dairy, and refined sugar. A vegan diet is defined by what it excludes for ethical, environmental or health reasons: meat, fish, eggs, dairy and usually honey.

Here’s how the rules line up:

What is the difference between paleo and vegan?
Food group	Paleo	Vegan	Agree?
Meat, poultry, fish, seafood	Yes, the center of most meals	No	No
Eggs	Yes	No	No
Dairy (milk, cheese, yogurt)	No (primal versions allow some)	No	Yes
Grains (wheat, rice, oats, corn)	No	Yes	No
Legumes (beans, lentils, peas, soy, peanuts)	No	Yes, main protein source	No
Vegetables and fruit	Yes, unlimited	Yes, unlimited	Yes
Nuts and seeds	Yes	Yes	Yes
Honey	Yes, in small amounts	Usually no	No
Refined sugar	No	Allowed, though health-focused vegans limit it	Partly
Processed foods	No, by definition	Allowed (vegan meats, snacks, sweets)	Partly

Table: editorial comparison of the common rules for each diet. Individual versions vary.

The last two rows matter more than people think. “Vegan” says nothing about processing: a diet of fries, soda and vegan cookies still qualifies. “Paleo” rules out most packaged food by definition. So the healthiest vegan and the healthiest paleo eater both end up eating mostly whole foods, while the worst versions of each look very different.

If you’d like to see where specific foods fall, the Is It Paleo? food checker covers hundreds of items. For a hybrid of the two, see pegan diet vs paleo; pegan borrows the plant-heavy plate from vegan and the no-dairy, no-refined-sugar rules from paleo, but it still includes meat.

Is paleo or vegan healthier?

The evidence for vegan and vegetarian eating is larger and longer-term; paleo’s evidence is mostly short trials. Neither has been tested against the other in a head-to-head trial that we could find.

Vegan and vegetarian diets. The Academy of Nutrition and Dietetics states that “appropriately planned vegetarian, including vegan, diets are healthful, nutritionally adequate, and may provide health benefits” and that vegetarians and vegans have reduced risk of heart disease, type 2 diabetes, high blood pressure, certain cancers and obesity (Melina et al., 2016). The EPIC-Oxford cohort, which has followed tens of thousands of British adults for decades, found vegetarians and vegans typically have lower BMI, LDL cholesterol and blood pressure than comparable meat-eaters, and vegans had a lower risk of diabetes. The same study also found lower bone density and a higher risk of fractures in vegans (Key et al., 2022).

Paleo. Paleo trials are smaller and shorter. In the longest, a 2-year randomized trial of 70 women with obesity, the paleo group lost more fat than a group on Nordic nutrition recommendations at 6 months (6.5 kg vs 2.6 kg), but by 24 months the difference was no longer significant (4.6 kg vs 2.9 kg). Triglycerides fell more on paleo at both points (Mellberg et al., 2014). Our paleo diet health benefits page covers the other trials.

So the fairer answer is: both can be healthy if well planned, the vegan evidence base is deeper, and each has a specific set of nutrients to watch.

What does real-world data say about paleo and vegan eaters?

Studies of how people actually eat tell a different story from ideal meal plans. Researchers at Tulane University classified 16,412 US adult diets from the 2005-2010 National Health and Nutrition Examination Survey (NHANES) into six patterns based on 24-hour food recalls, then scored each for quality and carbon footprint (O’Malley et al., 2023).

What does real-world data say about paleo and vegan eaters?
Diet pattern (as eaten)	Carbon footprint (kg CO2-eq per 1,000 kcal)	Diet quality finding
Vegan	0.69	Lower than pescatarian
Vegetarian	1.16	51.9 HEI, higher than omnivore
Pescatarian	1.66	Highest HEI score, 58.8
Omnivore (everything else)	2.23	48.9 HEI
Paleo	2.62	Second-lowest quality score
Keto	2.91	Lowest HEI score, 43.7

Source: O’Malley, Willits-Smith & Rose, American Journal of Clinical Nutrition, 2023 (abstract) and Tulane University’s summary of the study. HEI = Healthy Eating Index (0-100). Exact HEI scores for the vegan and paleo groups weren’t in the sources we could access, so we report only their ranking.

Using those numbers, a paleo-pattern day had a carbon footprint about 3.8 times that of a vegan day for the same calories (2.62 / 0.69).

Read this with its limits in mind. People were sorted by what they ate on a single day, not by the diet they said they followed, and the Tulane summary notes the diets were studied “as they are chosen by individuals, instead of prescribed by experts.” A careful paleo eater who fills half the plate with vegetables would likely score better than this average. Still, it’s a useful check on the idea that cutting grains and legumes automatically makes a diet healthier.

Which nutrients does each diet run short on?

Each diet removes a different set of foods, so each has a different set of gaps.

Which nutrients does each diet run short on?
Nutrient	Risk on paleo	Risk on vegan	Main fix
Vitamin B12	Low (meat, fish, eggs)	High: found naturally only in animal foods	Vegans need fortified foods or a supplement (MedlinePlus; NHS)
Calcium	Moderate: no dairy	Moderate: no dairy	Calcium-set tofu, fortified plant drinks (vegan); canned fish with bones, leafy greens (paleo)
Iodine	Moderate: no dairy, and higher if you use non-iodized sea salt	Moderate: no dairy or seafood	Iodized salt is the main US source (MedlinePlus); seafood on paleo
Vitamin D	Moderate	Moderate	Sun, oily fish (paleo), fortified foods or supplement (NHS)
Omega-3 (EPA/DHA)	Low if you eat oily fish	Higher: plant foods give ALA, not EPA/DHA	Oily fish (paleo); linseed, chia, walnuts or algae-based options (vegan)
Fiber	Higher: no grains or legumes	Low: legumes and whole grains	More vegetables, fruit, nuts and starchy roots on paleo
Iron	Low	Moderate: plant iron absorbs less well	Pair plant iron with vitamin C foods, avoid tea with meals (NHS)

Risk levels are our editorial reading of the sources linked, not measured prevalence. The EPIC-Oxford researchers list vitamin B12, vitamin D, calcium and iodine as the main risks “particularly in vegans” (Key et al., 2022); Harvard Health notes paleo can miss “healthy fiber, B vitamins, vitamin D, calcium” (Harvard Health Publishing).

The adult recommended intake for vitamin B12 is 2.4 micrograms a day (MedlinePlus). For iodine it’s 150 micrograms, rising to 220 in pregnancy (MedlinePlus). For paleo’s calcium, iodine and fiber gaps in detail, see closing the paleo nutrient gaps.

How do paleo and vegan compare for protein?

Both can meet protein needs, but they get there differently. Paleo protein is calorie-lean and carries B12; vegan protein carries fiber and, from calcium-set tofu, a lot of calcium, but more calories per gram of protein.

Worked example: what does 30 grams of protein cost in calories?

Thirty grams is a common per-meal protein target. We took USDA FoodData Central values per 100 g and scaled each food to 30 g of protein:

Worked example: what does 30 grams of protein cost in calories?
Food (diet)	Amount for 30 g protein	Calories	Fiber	Calcium	Vitamin B12	Iron
Chicken breast, cooked (paleo)	94 g	147	0 g	6 mg	0.19 mcg	0.5 mg
Salmon, farmed, cooked (paleo)	136 g	280	0 g	20 mg	3.80 mcg	0.5 mg
Eggs, hard-boiled (paleo)	238 g (about 5 large)	369	0 g	119 mg	2.64 mcg	2.8 mg
Firm tofu, calcium-set (vegan)	173 g	250	4.0 g	1,184 mg	0	4.6 mg
Tempeh (vegan)	148 g	284	not listed	164 mg	0.12 mcg	4.0 mg
Lentils, boiled (vegan)	333 g (about 1.7 cups)	386	26.3 g	63 mg	0	11.1 mg
Chickpeas, boiled (vegan)	339 g	555	25.7 g	166 mg	0	9.8 mg

Calculated from USDA FoodData Central SR Legacy entries: chicken 171140, salmon 175168, egg 173424, tofu 172475, tempeh 174272, lentils 172421, chickpeas 173757. Amount = 30 / protein per 100 g x 100; other nutrients scaled by the same factor.

What the table shows:

Calories: chicken breast delivers 30 g of protein for 147 calories; chickpeas need 555. That’s why paleo meals tend to be more filling per calorie, and why some people lose weight on paleo without counting.
Fiber: the lentil portion alone supplies 26 g of fiber. None of the paleo proteins supply any, so paleo eaters must get fiber from vegetables, fruit, nuts and roots.
B12 and calcium: salmon and eggs cover the 2.4 mcg B12 target in one portion; no plant protein here does. Calcium-set tofu is the calcium standout of the whole table.

For daily protein targets by body weight, see our paleo diet protein guide.

Is paleo or vegan better for weight loss?

Both can work, and the best one is the one you can keep. Paleo’s short-term advantage in the Mellberg trial faded by two years (Mellberg et al., 2014), which is a common pattern in diet trials. Vegans in EPIC-Oxford have lower average BMI than meat-eaters (Key et al., 2022), but that’s an observational finding in people who chose the diet, not proof the diet caused it.

Practical differences that affect weight:

Paleo’s lean proteins give more protein per calorie, which helps with fullness.
Vegan legumes and whole grains give more fiber, which also helps with fullness.
Vegan allows processed snacks and sweets; paleo doesn’t. For weight, that rule can matter more than meat versus beans.

Can you be paleo and vegan at the same time?

Technically, but it’s hard. A strict overlap removes meat, fish, eggs, dairy, grains and legumes at once, leaving vegetables, fruit, nuts, seeds and oils. Getting enough protein from nuts and seeds alone takes a lot of calories. Most people who try it relax one rule, usually allowing some legumes or soy, or eggs and fish. Our guides to vegetarian paleo and whether beans are paleo cover those trade-offs.

Who should choose which diet?

A simple decision rule, based on the evidence above:

Choose vegan (well planned) if your priorities are long-term heart and diabetes risk, a lower environmental footprint, or ethics, and you’re willing to take B12 and plan calcium, iodine and omega-3.
Choose paleo if you do best with high protein and low processed food, you tolerate grains or legumes poorly, and you’ll plan fiber, calcium and iodine.
Consider a middle path such as Mediterranean or pescatarian eating if neither rulebook appeals; pescatarian diets had the highest diet-quality score in the NHANES analysis. See paleo vs Mediterranean.

Get advice from your doctor or a registered dietitian before switching if you’re pregnant or breastfeeding, feeding children, have kidney disease, osteoporosis or a history of disordered eating, or take medication affected by diet.

Frequently asked questions about paleo vs vegan

Which is healthier, paleo or vegan?

A well-planned vegan diet has more long-term evidence, including lower rates of heart disease and diabetes in large cohorts. Paleo has shown short-term improvements in weight and triglycerides in small trials. Both can be healthy if you plan for their gaps: B12 and calcium on vegan, fiber and calcium on paleo.

Why do paleo and vegan both cut dairy?

For different reasons. Paleo excludes dairy because it came after the farming era began. Vegans exclude it because it’s an animal product. The practical result is the same: both need other calcium sources, such as calcium-set tofu or fortified plant drinks for vegans, and leafy greens or canned fish with soft bones for paleo eaters.

Is paleo or vegan better for the environment?

Vegan, by a wide margin. In a study of 16,412 US adult diets, vegan-pattern diets averaged 0.69 kg of carbon dioxide equivalents per 1,000 calories, while paleo-pattern diets averaged 2.62, about 3.8 times higher. Choosing poultry, eggs and fish over beef lowers a paleo diet’s footprint.

Do vegans need supplements that paleo eaters don’t?

Yes, vitamin B12. It’s found naturally only in animal foods, so vegans need fortified foods or a supplement. Both groups may need to plan vitamin D, iodine and calcium, and vegans often look for an algae-based source of the omega-3 fats found in oily fish. Ask your doctor about testing if you’re unsure.

Is paleo or vegan better for building muscle?

Both can support muscle gain if total protein is high enough. Paleo makes that easier because lean meats, fish and eggs pack more protein into fewer calories. Vegans can match it with tofu, tempeh, seitan and legumes, but usually eat more calories or larger portions to reach the same protein total.

Is paleo the same as eating plant-based?

No. Paleo includes plenty of plants, but meat, fish and eggs are central. “Plant-based” usually means a diet built mostly or entirely from plants, with legumes and whole grains as staples, both of which paleo excludes. The pegan diet sits between the two.

Your next step: pick the rules you’ll follow for a month

Neither diet is magic. Choose the one whose rules you’ll keep, then fix its known gaps from day one: B12 and calcium if you go vegan; fiber, calcium and iodine if you go paleo. To see how paleo compares with other popular plans, browse our paleo diet comparisons.

Consider this general nutrition reading, not a replacement for advice from your doctor or a registered dietitian. Talk to your doctor before making major changes to your diet, especially if you have a health condition or take medication.

Paleo vs Vegan: The Rule Differences, the Nutrients Each One Misses, and What the Research Says About Health and Carbon