Carnivore Diet vs Volumetrics
A side-by-side comparison — no verdict on which is "better," just how they differ.
Carnivore Diet
Eliminates all plant foods and eats only animal products (meat, fish, eggs, sometimes dairy) — an elimination diet taken to its extreme, with essentially no long-term clinical evidence.
View full Carnivore Diet page →Volumetrics
Organizes eating around a food’s energy density (calories per gram) rather than restricting any food group — building meals around lower-density, water- and fiber-rich foods to feel full on fewer calories.
View full Volumetrics page →Key Differences
- They differ a lot in strictness. Volumetrics sets few hard rules and bans nothing outright, while Carnivore removes every plant food.
- Carnivore cuts out grains, beans and lentils, and added sugar, while Volumetrics builds meals around whole grains and beans and lentils, and has no set rule on added sugar.
- On animal foods they sit far apart: Volumetrics includes animal foods such as fish, poultry, eggs, or dairy, whereas Carnivore eats only animal foods.
- The research behind them differs: Volumetrics has a moderate evidence base, while Carnivore has almost no clinical research behind it.
What They Share
These two have very little in common. Their core rules don’t overlap in any meaningful way.
Typical Foods
Carnivore DietMeat (including organ meats), fish, eggs, sometimes butter, cheese, or other dairy — no plant foods.
VolumetricsVery-low-density: broth-based soups, non-starchy vegetables, most fruit. Low-density: starchy vegetables, whole grains, legumes, low-fat dairy, lean protein — the everyday staples.
Foods to Avoid
Carnivore DietFruits, vegetables, grains, legumes, nuts, seeds, and added sugar — all plant foods entirely.
VolumetricsNone eliminated — higher-density foods (nuts, seeds, dried fruit, oils and butter, chips, chocolate, cookies) are enjoyed in smaller amounts, not banned.
Eating Pattern
Carnivore DietNo specific eating window. The exclusion list is the entire structure, not timing or macros.
VolumetricsNo specific eating window — organized around food energy density, not timing.
Primary Goal
Carnivore DietHealth motivation (93% of self-reported survey respondents cited health reasons), often symptom relief via extreme elimination.
VolumetricsWeight loss via increased fullness/satiety per calorie.
Best For
Carnivore DietNot clearly established — no RCTs exist to define who it suits; anyone considering it should treat it as a short, medically-supervised elimination experiment given the evidence gaps.
VolumetricsPeople who find restriction-based dieting hard to sustain because they end up hungry, and who like understanding the “why” behind a recommendation.
Macro Emphasis
Carnivore DietNo formal macro target, but by default very low-carb and high-protein/fat from removing all plant foods.
VolumetricsNone — organized around energy density (calories per gram), not macro ratios.
Health Condition Relevance
Carnivore DietNone demonstrated — anecdotal reports of autoimmune/IBS symptom relief are self-reported, not clinically confirmed.
VolumetricsNot tied to a specific health condition — a general weight-loss/satiety focus.
Evidence Strength
Carnivore DietMinimal: no randomized controlled trials exist. A 2026 scoping review found only 9 human studies (2021 to 2025), mostly surveys, case series, and case reports at the lowest evidence tiers, and concluded long-term safety “cannot be reliably assessed.”
VolumetricsModerate. A decades-long Penn State research program (Dr. Barbara Rolls) shows lower energy density reduces calorie intake, and a year-long trial in 97 women found adding fruit and vegetables to a reduced-fat diet led to more weight loss and less hunger. A 2022 meta-analysis found no significant weight effect, and long-term results are inconsistent.
Restrictiveness
Carnivore DietVery high — eliminates an entire kingdom of food (all plants), zero dietary fiber by design.
VolumetricsLow — no foods eliminated, just density-tier awareness; requires some ongoing attention to food composition rather than fixed rules.
Cost / Accessibility
Carnivore DietCost depends heavily on which cuts are prioritized: organ meats and cheaper cuts keep cost comparable to a moderate food budget, while relying mainly on premium muscle cuts can push grocery spending well above a standard mixed diet.
VolumetricsBuilt on inexpensive, widely available staples (produce, whole grains, legumes, broth-based soups, lean protein) with no specialty products required, making it one of the more budget-friendly structured approaches.
Nutrients to Watch
Carnivore DietFiber is close to zero. Reported intakes often fall short on vitamin C, vitamin D, calcium, magnesium, thiamin, potassium, and iodine. No scurvy cases have been reported so far.
VolumetricsNo gaps are documented. Low-energy-density diets are linked with higher intake of vitamins A, C, and B6, folate, iron, calcium, and potassium.
Adjustment Period
Carnivore DietSome people report headache, dizziness, and fatigue early on, similar to keto flu. LDL cholesterol rose substantially in observational studies. Among long-term followers surveyed, digestive and other symptoms were uncommon, but that survey only reached people who stayed on the diet.
VolumetricsLittle is known. In its main year-long trial, the group eating more fruit and vegetables reported less hunger, not more.
A Sample Day
Carnivore DietBreakfast: eggs scrambled in butter, with bacon. Lunch: ground beef patties with a slice of hard cheese. Dinner: pan-seared steak or salmon, with beef liver once or twice a week. Snack: sugar-free beef jerky or hard-boiled eggs.
VolumetricsBreakfast: oatmeal with berries and a hard-boiled egg. Lunch: broth-based vegetable soup, then a turkey sandwich on whole-grain bread with lettuce and tomato. Dinner: big green salad, grilled fish, brown rice, and roasted vegetables. Snack: grapes with nonfat Greek yogurt.
Prep and Eating Out
Carnivore DietLow to moderate prep, mostly searing or grilling meat. Steakhouses and bunless burgers are easy, but most sides and cuisines don’t fit. Followers often report social conflict with family, friends, and clinicians.
VolumetricsLow to moderate prep, since soups and salads can be made in batches and nothing is tracked. Easy to eat out: start with a broth-based soup or salad and fill up on vegetables.
Talk to a Clinician First If
Carnivore DietPeople with high LDL, heart disease, or familial high cholesterol should talk to a clinician first. A history of high triglycerides, pancreatitis, kidney stones, gout, or kidney disease also calls for caution. People on diabetes medication need supervision, since many report reducing their medication. No data exist for pregnancy or children.
VolumetricsNot studied. No specific cautions have been published for Volumetrics.
Sticking With It and Stopping
Carnivore DietLittle is known. No trial has measured adherence, and surveys only include people who stayed on the diet for at least six months. A recent review concluded that long-term adherence cannot be recommended. No study has followed people after they stop.
VolumetricsIn its year-long trial, about 73% of participants finished. In a small seven-month trial, a low-energy-density diet reduced weight regain after weight loss. Over the long term, lower-density diets have not consistently produced more weight loss than calorie restriction alone.
Educational only, not medical advice. Want to compare a different pair? Back to Diet Arena.