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Dr Berg carnivore diet experiment revealed mixed results. His experience offers an interesting look at the carnivore diet, but it does not prove that the diet works for everyone or is safe to follow over the long term. Dr Eric Berg noted less bloating but returned to plants, raising questions about long-term viability. Two weeks is a short period, and one person’s experience cannot replace controlled research.
So, what exactly did Dr. Berg eat? What did he notice, and why did he decide not to continue? Here is a closer look at his experiment and wh
What Is the Carnivore Diet?
The carnivore diet is an eating pattern that relies almost entirely on animal-based foods. Depending on the version, people may eat meat, poultry, fish, eggs and some dairy products. Strict versions exclude all plant foods, including vegetables, fruits, grains, beans, nuts and seeds.
The idea is simple: remove plant foods and obtain most or all of your food from animal sources. Some people follow this approach because they want to simplify their meals, reduce carbohydrate intake or see whether removing certain foods changes their symptoms.
However, the diet is highly restrictive. Removing entire food groups can make it harder to obtain enough fibre and certain vitamins and minerals. Its long-term effects have not been established by strong clinical evidence.
The carnivore diet is also different from a typical ketogenic diet. Keto allows low-carbohydrate plant foods, such as leafy greens, nuts and seeds. A strict carnivore diet does not.
What Did Dr. Berg Eat on the Carnivore Diet?
In his two-week experiment, Dr. Berg reported eating several types of animal-based foods, including:
- Beef
- Pork
- Eggs
- Seafood
- Shellfish
- Dairy products
These foods fit within many versions of the carnivore diet. However, the exact foods allowed can vary from one person to another. Some people include dairy, while others avoid it. Some eat eggs and seafood, while stricter versions focus mainly on meat.
The important point is that Dr. Berg’s experiment was not simply about eating beef. His reported food choices included several animal products.
His experience also raises a common question: does eating only animal foods automatically make a diet nutritionally complete? Not necessarily. Nutrient intake depends on the foods selected, the amounts eaten and the person’s individual needs. A diet can contain plenty of protein and still fall short in other important areas.
What Happened During Dr. Berg’s Two-Week Experiment?
Dr. Berg discussed several observations from his experiment. These were his personal reports, not results from a controlled clinical trial.
1. He reported little change in his energy levels
Dr. Berg reported no major change in his energy during the two-week period. This is worth noting because people often ask whether removing carbohydrates will make them feel more energetic or tired.
There is no single response that applies to everyone. Some people report changes in energy when they alter their diet, while others notice little difference. The result may depend on food intake, sleep, activity, health and how the person adapts to the new eating pattern.
Dr. Berg’s experience cannot predict how another person will feel on the same diet.
2. He noticed less bloating after removing nuts
One of the observations discussed in his experiment was a reduction in bloating after he stopped eating nuts.
This does not establish that nuts cause bloating in everyone. Digestive symptoms can have several causes, and a person’s response to a particular food can vary. Removing several foods at once also makes it difficult to identify which change was responsible for a symptom improvement.
Someone who experiences repeated bloating may benefit from discussing the symptoms with a qualified healthcare professional rather than removing whole food groups without guidance.
3. The experiment did not establish long-term results
Two weeks can provide an individual with observations about a change in eating habits, but it cannot show whether that diet will remain effective or safe over months or years.
A short experiment also cannot establish whether a diet prevents disease, corrects a nutrient deficiency or improves long-term health. Those questions require suitable research involving more people and longer follow-up.
For this reason, Dr. Berg’s reported experience should be understood as a personal account rather than proof of the diet’s health effects.
Why Did Dr. Berg Stop the Carnivore Diet?
After the experiment, Dr. Berg chose to return to a broader eating pattern that included salads, fermented vegetables and berries.
This is an important part of the story. His two-week experiment did not result in a decision to continue eating only animal foods indefinitely.
Returning to a wider range of foods allows more variety in the diet. Vegetables, fruits, nuts, seeds and other plant foods provide nutrients and dietary fibre that are absent or limited in strict carnivore eating patterns.
It is important not to assign a reason to Dr. Berg’s decision beyond what he reported. His choice to reintroduce plant foods does not, by itself, prove that the carnivore diet failed or that every person will have the same experience. It simply describes the outcome of his personal experiment.
For readers considering the diet, the more useful question is whether a restrictive eating pattern can meet their nutritional needs and remain suitable for their health over time.
What Did Dr. Berg Say About Vitamin C?
Vitamin C is an important nutrient that helps the body make collagen, supports normal immune function and helps with wound healing. The body cannot make vitamin C on its own, so it must come from food or, when appropriate, supplements.
Many common sources of vitamin C are plant foods. These include oranges, kiwifruit, strawberries, peppers, broccoli and tomatoes. Some animal foods, particularly certain organ meats, can contain vitamin C, but the amount varies by food and preparation.
The concern with a strict carnivore diet is not simply whether a person eats meat. It is whether their overall diet provides enough of every essential nutrient.
A 2026 scoping review published in Nutrients examined nine human studies on the carnivore diet. The researchers found that the available evidence was limited by small sample sizes, short study periods and a lack of control groups. They also identified possible nutritional concerns, including inadequate vitamin C, vitamin D, calcium, magnesium, iodine and dietary fibre.
This review does not establish that every person following a carnivore diet will develop a deficiency. It does show why claims about long-term nutritional adequacy should be treated carefully.
For more information about vitamin C requirements and food sources, see the US National Institutes of Health Office of Dietary Supplements.
Is the Carnivore Diet the Same as Keto?
No. Both diets can be low in carbohydrates, but they differ in the foods they allow.
| Feature | Carnivore diet | Ketogenic diet |
|---|---|---|
| Main food sources | Animal-based foods | Animal and plant foods |
| Meat, fish and eggs | Usually included | Usually included |
| Vegetables | Excluded in strict versions | Low-carbohydrate vegetables are commonly included |
| Nuts and seeds | Excluded in strict versions | Often included |
| Fruit | Excluded in strict versions | Limited amounts of selected fruits may fit |
| Dietary fibre | Usually very low | Depends on food choices |
| Food variety | Highly restricted | Can offer a wider range of foods |
A ketogenic diet aims to keep carbohydrate intake low enough to support ketosis, a metabolic state in which the body produces and uses ketones for energy. A carnivore diet excludes plant foods regardless of whether a particular plant food could fit within a ketogenic diet.
Some people use the term ketovore for an approach that focuses on animal foods but allows selected low-carbohydrate plant foods. The exact definition varies.
The main difference is food choice. Keto does not require a person to avoid all plant foods.
What Are the Possible Risks of a Carnivore Diet?
The carnivore diet removes many foods that are commonly included in balanced eating patterns. This restriction raises several questions about nutritional adequacy and long-term health.
Low fibre intake
Fibre is found in foods such as vegetables, fruit, beans, whole grains, nuts and seeds. A strict carnivore diet excludes these sources, so fibre intake is generally very low.
People respond differently to dietary changes, but removing fibre-rich foods can affect bowel habits. The long-term effects of following a strict carnivore diet are not yet well understood.
Possible nutrient gaps
Meat, fish, eggs and dairy provide important nutrients. However, no single food group supplies everything the body needs in the right amounts for every person.
The 2026 scoping review found possible gaps in several nutrients among the dietary patterns examined. The actual risk will depend on food choices, portions, preparation methods and individual needs.
Cholesterol and heart health
Some carnivore diets contain large amounts of foods high in saturated fat. Saturated fat can raise LDL cholesterol, often called “bad” cholesterol. Higher LDL cholesterol is a recognised risk factor for cardiovascular disease.
The effect of a particular diet will depend on its overall composition and the individual. People should not assume that removing carbohydrates automatically improves every marker of health.
Uncertain long-term effects
The strongest limitation is the lack of good long-term research on the carnivore diet itself. Short-term changes in weight, appetite or symptoms do not establish long-term safety.
A review of nine human studies published in 2026 concluded that the evidence was too limited to reliably assess long-term effects. The authors also identified potential nutritional and cardiovascular concerns.
You can read the review in Nutrients.
Does Dr. Berg’s Experience Prove That the Carnivore Diet Works?
No. His experience can help readers understand what one person reported during a short experiment, but it cannot establish that the diet is effective or safe for everyone.
There are several reasons for this distinction:
- The experiment was short. Two weeks cannot establish long-term effects.
- It was a personal experience. It was not a controlled clinical trial comparing the carnivore diet with another eating pattern.
- Several dietary changes occurred together. When a person removes multiple foods, it may be difficult to identify which change affected a symptom.
- Individual responses vary. A diet that one person tolerates may not suit another.
- Anecdotes cannot establish medical outcomes. Personal observations are useful for generating questions, but they do not replace scientific research.
The same standard should apply to positive and negative claims. One person’s experience does not prove that the diet will work, and it does not prove that every person will experience harm.
Readers should look at the broader evidence, consider their own health needs and seek professional advice before making major dietary changes.
Should You Try the Carnivore Diet?
Dr. Berg’s experiment alone is not enough to determine whether the carnivore diet is suitable for you.
Before starting a highly restrictive diet, consider what you want to achieve, whether the diet can meet your nutritional needs and whether a less restrictive approach could meet the same goal.
It is particularly important to seek individual medical or dietetic advice if you have a chronic health condition, take medication that may be affected by dietary changes, or have a history of nutritional deficiencies.
A qualified healthcare professional can help you assess your diet in the context of your health, medical history and goals. Do not stop prescribed treatment or medication because of a claim made in a diet video.
For general background, Harvard Health Publishing’s overview of the carnivore diet discusses its food restrictions and potential risks.
Frequently Asked Questions
How long did Dr. Berg follow the carnivore diet?
Dr. Berg described a two-week carnivore diet experiment. His account should not be confused with a long-term clinical study.
What foods did Dr. Berg eat?
He reported eating beef, pork, eggs, seafood, shellfish and dairy products during the experiment.
Did Dr. Berg report more energy on the carnivore diet?
He reported no major change in his energy levels during the two-week experiment. This is his personal observation, not a prediction of how others will respond.
Did Dr. Berg experience less bloating?
He reported less bloating after removing nuts. That observation does not mean nuts cause bloating in everyone or that a carnivore diet is a proven treatment for digestive problems.
Why did Dr. Berg return to eating plant foods?
After the experiment, he chose to include foods such as salads, fermented vegetables and berries again. His account does not establish that the same decision is necessary for every person.
Is the carnivore diet better than keto?
There is not enough evidence to conclude that the carnivore diet is generally better than keto. Keto allows selected plant foods and can offer more variety. The suitability of either approach depends on the individual, the diet’s nutritional quality and the person’s health needs.
Is the carnivore diet safe over the long term?
Its long-term safety has not been established by strong research. A 2026 scoping review found only nine human studies and highlighted important evidence limitations and potential nutritional risks.
Does a carnivore diet provide enough vitamin C?
That depends on the foods eaten and their nutrient content. Some animal foods contain vitamin C, but many common sources are fruits and vegetables. A restrictive diet should not be assumed to meet every nutrient requirement without careful assessment.
The Bottom Line
Dr. Berg’s two-week carnivore diet experiment offers a personal account of what he ate, what he noticed and his decision to return to a wider range of foods. He reported little change in energy and less bloating after removing nuts, but these observations do not establish how the diet will affect other people.
The larger question is whether a diet that excludes entire food groups can provide adequate nutrition and remain safe over time. Current research is limited, and long-term effects are still uncertain.
Rather than treating one person’s experiment as a final answer, readers should use it as a starting point for asking better questions about food choices, nutritional needs and the quality of the available evidence.
Sources and Further Reading
- Dr. Berg: Carnivore Diet Weight Loss Tips, Benefits, and Risks
- Carnivore Diet: A Scoping Review of the Current Evidence, Potential Benefits and Risks — Nutrients, 2026
- NIH Office of Dietary Supplements: Vitamin C
- Harvard Health Publishing: What Is the Carnivore Diet?
Disclaimer:
This article is for general educational purposes only and does not constitute medical advice, diagnosis, or treatment. The information presented regarding Dr. Berg’s personal experiment and the carnivore diet is based on anecdotal reports and limited scientific evidence, which cannot replace professional clinical guidance. Always consult with a qualified healthcare provider before making significant dietary changes, especially if you have pre-existing health conditions, take medications, or have specific nutritional needs. Do not disregard professional medical advice or delay seeking it because of something you have read in this article.
