Paleo vs. Keto vs. Carnivore: A Certified Physician’s Guide to Choosing the Right Dietary Approach for Your Metabolism

The online dietary landscape has never been more confusing — and never more consequential. The paleo, ketogenic, and carnivore dietary approaches all claim substantial health benefits, and all have legitimate evidence supporting their use in specific patient populations. But they are not interchangeable. Each has a different mechanism of action, a different evidence base, and a different ideal clinical application. The right diet for your body depends on your specific metabolic health, your inflammatory drivers, your gut microbiome, your hormonal profile, and your personal health goals. Here’s how to think about the decision.

The Three Approaches: Core Principles

Paleo: The Anti-Inflammatory Whole Food Foundation

The paleo diet focuses on foods available to pre-agricultural humans: quality meats, fish, eggs, vegetables, fruits, nuts, seeds, and healthy fats — while eliminating grains, legumes, dairy, refined sugars, and processed foods. Its primary mechanisms are anti-inflammatory (elimination of processed food and refined carbohydrate inflammatory drivers), gut-supportive (removal of common irritants like gluten and lectins), and nutritionally dense (emphasis on whole, minimally processed foods).

Ketogenic: The Metabolic and Neurological Therapeutic

The ketogenic diet reduces carbohydrate intake below the threshold needed to maintain carbohydrate-based metabolism, inducing nutritional ketosis. Its primary mechanisms are metabolic (profound insulin reduction, fat-burning adaptation), anti-inflammatory (BHB-mediated NLRP3 inflammasome inhibition), and neurological (providing ketone-based fuel that bypasses neuronal insulin resistance).

Carnivore: The Maximal Elimination Protocol

The carnivore diet eliminates all plant foods, providing the most comprehensive dietary antigen elimination possible. Its primary mechanisms are immunological (removal of all plant-derived immune triggers including lectins, gluten, oxalates, salicylates, and FODMAPs), metabolic (zero-carbohydrate, ketogenic by default), and elimination (the only dietary protocol that removes every possible plant-derived reactive compound simultaneously).

Clinical Indications: Which Conditions Respond Best to Each Approach

Choose Paleo When:

• You’re new to dietary intervention and need a sustainable, broadly anti-inflammatory starting point
• Your primary goals are reducing processed food intake and general inflammation
• You want to maintain dietary variety and are not dealing with severe food sensitivities
• You’re using diet to support general wellness and disease prevention rather than treating a specific acute condition

Choose Ketogenic When:

• Insulin resistance, metabolic syndrome, prediabetes, or type 2 diabetes is your primary concern
• You’re dealing with neurological conditions — epilepsy, cognitive decline, Alzheimer’s risk, migraine, mood disorders
• You need significant weight loss in the context of metabolic dysfunction
• You want to maximize the anti-inflammatory signaling effects of BHB alongside dietary benefits

Choose Carnivore When:

• You have complex, multi-food sensitivities that haven’t resolved on paleo or AIP
• You have an autoimmune condition with suspected dietary antigen drivers
• You have refractory gut conditions — SIBO, IBD, IBS — where even paleo foods cause symptoms
• You’ve exhausted other dietary approaches and want the most comprehensive elimination protocol possible
• You’re using diet therapeutically under physician supervision for a specific, serious condition

The Role of Lab Testing in Dietary Decision-Making

Selecting a dietary approach without understanding your metabolic phenotype is guesswork. Dr. Gomes uses functional lab testing to inform dietary recommendations — ensuring that the dietary intervention is matched to the specific metabolic, inflammatory, and immune patterns driving your condition.

• HOMA-IR and fasting insulin: indicate whether insulin resistance is a primary driver (argues for keto or carnivore)
• Food sensitivity panel (IgG): identifies specific reactive foods guiding elimination depth
• Inflammatory markers (hs-CRP, IL-6): indicate degree of systemic inflammation
• Microbiome analysis: guides prebiotic and fermented food decisions (may argue for or against high plant intake)
• Autoimmune antibodies: elevated panels support more aggressive dietary antigen elimination
• Lipid fractionation: genetic variants and particle patterns guide fat intake recommendations on higher-fat diets

A Practical Framework for Getting Started

Most patients benefit from starting with the least restrictive approach that addresses their specific drivers, then escalating restriction if response is insufficient. For most patients with general inflammation and metabolic health goals, paleo is the appropriate starting point. For patients with clear insulin resistance, keto is the preferred first step. For patients with autoimmune disease, complex food sensitivities, or refractory gut conditions, carnivore may be indicated as the initial intervention, with reintroduction of tolerated foods during a structured follow-up protocol.