Carnivore diet

Carnivore diet is an elimination diet that involves consuming only animal products, using meat, organs, and animal fats as primary sources of nutrients.

For broader context, check out the complete guide to proper nutrition — a foundational manual from the expert team at Sport Zona.

What it is

The carnivore diet is an elimination diet where the only foods consumed are of animal origin. This approach completely excludes all plant-based products, including fruits, vegetables, grains, nuts, seeds, and legumes. The main idea behind the diet is that the human body has evolved to feed primarily on meat and fats, and plant foods may contain antinutrients and other compounds that can potentially cause inflammation or digestive issues.

In its strictest form, the carnivore diet consists mainly of red meat (beef, lamb, pork), poultry, fish, eggs, and organ meats (liver, kidneys, heart). Some less strict versions may include low-lactose dairy products, such as butter or hard cheeses. Water is the primary beverage, with some allowing coffee and black tea, although in the strict version, these are also avoided.

How it works

The mechanism of the carnivore diet is based on several key principles. The elimination of carbohydrates puts the body into a state of ketosis, where the body uses fat as its primary energy source instead of glucose. This can lead to stable blood sugar levels and reduced insulin spikes. The high protein content in the diet supports satiety, maintains muscle mass, and provides amino acids for tissue repair.

In addition to ketosis, the diet aims to reduce food allergens and sensitivities, as common ones like gluten, lactose, lectins, and oxalates are automatically excluded. This can lead to improved digestion and reduced systemic inflammation. The intake of animal fats provides essential fat-soluble vitamins (A, D, E, K) as well as essential fatty acids, which are vital for cell function and hormonal balance. This diet potentially optimizes metabolism towards using fat for energy, which can be an advantage during prolonged physical exertion.

Why it's important for athletes

For athletes, the carnivore diet can offer several benefits, albeit with potential challenges. The high protein intake is essential for muscle recovery and growth, especially for strength athletes. The recommended daily protein intake for active individuals ranges between 1.6 and 2.2 grams per kilogram of body weight, which is easily achieved with the carnivore diet. Animal proteins are complete, containing all essential amino acids that are key for muscle protein synthesis.

Using fat as the primary energy source can provide stable and long-lasting energy, which is beneficial for endurance athletes such as marathoners or ultramarathoners. Some athletes report reduced gastrointestinal distress during intense training, which may be due to the elimination of plant fibers and complex carbohydrates. Furthermore, consuming organ meats like liver provides high levels of iron (up to 17 mg per 100g) and other micronutrients important for energy production and oxygen transport, which are critical for athletic performance.

Related concepts

• Keto diet — The carnivore diet is essentially a stricter version of the keto diet, focused solely on animal products, while the keto diet also allows some plant-based foods.
• Ketosis — The carnivore diet leads the body into a metabolic state of ketosis, as it excludes carbohydrates and promotes the use of fat for energy.
• Paleo diet — Both diets emphasize natural foods, but the paleo diet allows fruits, vegetables, and nuts, while the carnivore diet restricts intake to only animal products.
• Intermittent fasting (IF) — Many people combine the carnivore diet with intermittent fasting, as the high protein and fat content in animal foods helps maintain satiety for longer periods without eating.