Animal-Based 30-Day Challenge | Rules, Foods & Results

The Animal-Based 30-Day Challenge is a short-term experiment in which you follow an animal-based eating pattern for 30 days while tracking how the diet fits your appetite, digestion, energy, body measurements, and daily routine.

There is no single standardized animal-based diet. Some versions emphasize meat and organs along with fruit, honey, and dairy, while stricter versions move closer to a carnivore diet. The official Animal Based 30 (AB30) program from Heart & Soil describes its approach as meat, organs, fruit, honey, and raw dairy, combined with lifestyle and community components.

A 30-day challenge can help you observe your own response and adherence. It cannot prove that the diet caused a health improvement or establish its long-term safety.

What Is the Animal-Based 30-Day Challenge?

An animal-based 30-day challenge is a time-limited dietary experiment based primarily on animal foods, with some versions also including fruit, honey, and dairy.

The goal is usually to follow a defined set of food rules consistently for 30 days and then evaluate what happened.

The challenge format is different from simply deciding to follow an animal-based diet indefinitely. You establish a starting point, follow the selected rules, track relevant changes, and review the results at the end.

The official AB30 program is a specific program associated with Heart & Soil. It combines diet, lifestyle, and community elements. Its published description includes meat, organs, fruit, honey, and raw dairy.

A generic animal-based 30-day challenge, however, does not have to follow every rule of the official program.

How Does the 30-Day Challenge Work?

A practical challenge has four basic stages:

1. Define your version of the diet.
2. Record a baseline before starting.
3. Follow the same general rules for 30 days.
4. Compare your observations with your baseline.

Keeping the rules consistent matters more than making the challenge increasingly restrictive.

For example, changing from a broad animal-based diet to an almost entirely animal-food diet halfway through the month makes the final comparison harder to interpret.

Your challenge should therefore have clearly defined rules before Day 1.

Animal-Based 30-Day Challenge Rules

There is no universally accepted rulebook for every animal-based challenge.

A practical version can use these rules:

1. Center meals on animal foods

Common choices include:

• Beef and other meats
• Poultry
• Fish and seafood
• Eggs
• Organ meats, if desired
• Dairy, if tolerated
• Animal fats

2. Decide whether fruit is included

Many animal-based approaches include fruit.

This is one of the major differences between a broader animal-based diet and a strict carnivore diet.

3. Decide how honey fits your version

Some animal-based protocols include honey as an added carbohydrate source.

If you use it, define the amount or circumstances before beginning rather than changing your intake based on day-to-day results.

4. Decide what foods you will avoid

Depending on your chosen version, this may include:

• Ultra-processed foods
• Sugar-sweetened foods
• Refined snacks
• Certain vegetable oils
• Grains
• Legumes
• Most vegetables

There is no universal rule requiring every one of these exclusions. Define your own protocol clearly.

5. Keep the rules consistent

A useful challenge is easier to evaluate when you know what you actually followed.

If you make a major change during the 30 days, record it rather than pretending the entire month followed the original protocol.

What Can You Eat During an Animal-Based 30-Day Challenge?

The exact food list depends on the version you choose.

This table is intentionally a challenge-level overview, not another complete animal-based food list.

For a more detailed list of foods, use your Animal-Based Diet Food List article.

For shopping, see the Animal-Based Diet Grocery List.

Can You Eat Fruit on the Challenge?

Yes, if your chosen version of the challenge includes fruit.

Fruit is one of the main differences between many animal-based approaches and carnivore diets.

Fruit also contributes nutrients such as vitamin C. The NIH identifies fruits and vegetables as the best food sources of vitamin C.

The amount and type of fruit can vary considerably between different animal-based protocols, so the important point is to define your rules before Day 1.

Do You Need Organ Meat?

No single food is required for every animal-based 30-day challenge.

Some animal-based protocols place a strong emphasis on organ meats, while other approaches use them less frequently or not at all.

If you include liver or another organ meat, consider it as part of the overall dietary pattern rather than assuming that more is automatically better.

Your goal during a 30-day experiment should be a clearly defined and sustainable eating pattern, not simply maximizing the number of animal foods you consume.

What Foods Are Limited or Avoided?

This depends on the specific challenge.

A stricter version may remove:

• Grains
• Legumes
• Most vegetables
• Processed snack foods
• Added sugars
• Certain industrially refined foods
• Alcohol

A broader version may include some additional plant foods.

This is why two people can both describe their diet as “animal-based” while eating substantially different diets.

Avoid treating one person’s protocol as the universal definition of animal-based eating.

Your 30-Day Animal-Based Challenge: Week by Week

The purpose of a week-by-week structure is not to predict exactly what your body will do.

Instead, each week has a practical objective.

Days 1–7: Establish Your Baseline

The first week is about consistency.

Before or at the beginning of the challenge, record:

• Body weight, if relevant
• Waist measurement
• Typical hunger
• Energy levels
• Sleep
• Digestion
• Bowel habits
• Training performance, if relevant
• Typical food intake

Do not change everything at once without recording what changed.

The goal is to create a useful starting point.

Days 8–14: Build Consistency

During the second week, focus on following your selected rules.

Record practical problems such as:

• Strong cravings
• Hunger between meals
• Difficulty finding suitable foods
• Digestive discomfort
• Difficulty eating socially
• Problems maintaining your normal routine

This information may be more useful than trying to predict a specific biological “adaptation.”

Days 15–21: Track Your Changes

By the third week, compare your observations with your baseline.

Look at trends rather than individual days.

For example, ask:

• Has hunger changed?
• Has digestion changed?
• Has your body weight changed?
• Has your waist measurement changed?
• Has your sleep changed?
• Has your training performance changed?
• Has adherence become easier or harder?

A change does not automatically mean the diet caused it.

Days 22–30: Finish and Evaluate

The final week is about completing the experiment and preparing for an honest review.

Ask:

• Did I follow the challenge consistently?
• Which foods worked well for me?
• Which foods caused problems?
• What changed compared with baseline?
• What stayed the same?
• Was the diet practical?
• Was it affordable?
• Could I maintain it?
• Did I experience any concerning symptoms?

Do not judge the challenge only by body weight.

What Should You Track During 30 Days?

A simple tracker can make the experiment much more useful.

You do not need to measure everything every day.

A simple food and symptom diary may be enough.

Most importantly, record major deviations from your original challenge rules.

What Results Might You Notice?

People may report changes in areas such as:

• Body weight
• Waist measurement
• Hunger
• Food cravings
• Digestion
• Energy
• Sleep
• Exercise performance
• Food preferences
• Ability to follow the diet

But these are possible observations, not guaranteed outcomes.

Weight can change because of calorie intake, fluid shifts, food volume, activity and other factors. Energy and digestion can also change for many reasons.

A 30-day experiment can show you what happened during those 30 days. It cannot by itself establish why the change happened.

Can You Lose Weight During an Animal-Based 30-Day Challenge?

Possibly, but weight loss is not guaranteed.

A person’s weight can change during a 30-day dietary experiment for many reasons, including changes in calorie intake, food choices, appetite, activity, water balance and adherence.

Therefore, avoid treating a weight change as proof that the animal-based diet itself caused fat loss.

If weight management is your goal, tracking waist measurement alongside body weight can provide additional context.

What Can 30 Days Actually Tell You?

A well-tracked challenge can answer practical questions such as:

• Can I follow this eating pattern?
• Do I enjoy the foods?
• Does it fit my budget?
• Does it fit my work and social life?
• How does my hunger change?
• How does my digestion change?
• What happens to my weight and waist measurement?
• Do I experience any problems?
• Would I want to continue?

It cannot answer questions such as:

• Does this diet prevent heart disease?
• Does it cure an autoimmune disease?
• Does it reduce chronic inflammation?
• Does it permanently improve metabolism?
• Is it healthier than every other dietary pattern?
• Is it safe for long-term use?

Those questions require appropriate scientific evidence, not a single 30-day personal experiment.

What Does the Research Say About 30 Days on an Animal-Based Diet?

Research specifically testing a 30-day animal-based diet is limited.

Some evidence comes from related dietary patterns, particularly carnivore diets, but those findings should not automatically be applied to every animal-based diet.

A 2026 scoping review of carnivore research identified only nine human studies and reported important limitations, including small sample sizes, short study durations and a lack of control groups. The review also identified concerns involving nutrient adequacy, dietary fiber and blood lipids.

That evidence is relevant when considering highly restrictive animal-food patterns, but carnivore and animal-based diets are not interchangeable.

A broader animal-based diet that includes fruit and other foods can have a substantially different nutrient profile.

What About Fiber and Vitamin C?

Fiber intake depends on how the diet is constructed.

A pattern consisting almost entirely of animal foods provides little or no dietary fiber. An animal-based pattern that includes fruit provides some fiber.

Fruit can also contribute vitamin C. NIH identifies fruits and vegetables as major food sources of vitamin C.

This is one reason it is important to define the exact version of an animal-based diet rather than treating every version as nutritionally identical.

What About Saturated Fat and LDL Cholesterol?

Some animal-based eating patterns can provide substantial amounts of saturated fat, particularly when they emphasize fatty meat, butter, full-fat dairy and animal fats.

The American Heart Association notes that excessive saturated fat intake can raise LDL cholesterol, and higher LDL is associated with increased cardiovascular risk.

That does not mean every animal-based diet will produce the same lipid response.

Food choices, quantities, total dietary intake and individual factors all matter.

If you have elevated cholesterol or another condition requiring dietary management, discuss major dietary changes with an appropriate healthcare professional.

Animal-Based 30-Day Challenge vs Carnivore Diet

These terms should not be treated as synonyms.

The exact boundaries can vary, but fruit and other plant foods are a major practical distinction.

This also means research on carnivore diets should not automatically be presented as research on all animal-based diets.

Problems You May Encounter During the Challenge

A restrictive eating pattern can create practical or dietary difficulties.

Possible problems include:

• Changes in bowel habits
• Constipation or digestive discomfort
• Difficulty eating socially
• Limited food variety
• Difficulty maintaining the rules
• Excessive reliance on high-saturated-fat foods
• Difficulty meeting nutritional needs on very restrictive versions

Do not assume that persistent or severe symptoms are simply a normal “adaptation.”

If you develop concerning or persistent symptoms, stop and seek appropriate medical advice.

What About Raw Dairy?

Some official AB30 materials include raw dairy as part of their animal-based approach.

However, raw milk and products made from raw milk can carry harmful pathogens.

For that reason, raw dairy should not be presented as a risk-free food choice. Consider food-safety guidance in your country before consuming it, particularly if you are in a group at increased risk from foodborne illness.

Pasteurized dairy provides an alternative for people who choose to include dairy without the risks associated with consuming unpasteurized milk.

Who Should Be Cautious With a Restrictive Diet?

A restrictive dietary experiment is not appropriate for everyone.

Talk with an appropriate healthcare professional before making a major dietary change if you:

• Are pregnant or breastfeeding
• Are a child or adolescent
• Have a medical condition requiring dietary management
• Take medications affected by major dietary changes
• Have a history of disordered eating
• Have previously experienced problems with restrictive diets

The more medically complex your situation, the less appropriate it is to treat a 30-day internet diet challenge as a self-directed health intervention.

Official Animal Based 30 vs a Generic 30-Day Challenge

These are related but different concepts.

Animal Based 30 (AB30) is a specific program published by Heart & Soil. Its current materials describe a 30-day diet and lifestyle challenge with community, educational material and a food approach centered on meat, organs, fruit, honey and raw dairy.

A generic animal-based 30-day challenge simply means following a defined animal-based dietary pattern for 30 days.

You do not need to claim that your personal challenge is the official AB30 program unless you are actually following that program.

This distinction also matters when evaluating health claims. Promotional statements from an official challenge or personal reports from participants are not equivalent to controlled scientific evidence.

What Should You Do After Day 30?

Do not automatically continue the diet simply because you completed the challenge.

Review your results first.

Ask yourself five questions:

1. What changed?

Review weight, waist, hunger, energy, digestion, sleep and other measurements.

2. What did not change?

Negative or neutral results are still useful information.

3. What caused practical problems?

Consider cost, food availability, social situations and dietary restrictions.

4. Did you experience concerning symptoms?

If so, don’t ignore them simply because the challenge is finished.

5. What pattern is sustainable?

The best long-term eating pattern is not necessarily the most restrictive one.

If you want to continue eating animal-based foods, you can reassess the amount and variety of foods rather than assuming that the exact 30-day rules must continue indefinitely.

For practical meal ideas, see the 7-Day Animal-Based Diet Meal Plan.

For the broader evidence on potential benefits and risks, see Animal-Based Diet Benefits and Risks.

Frequently Asked Questions

How long is an animal-based diet challenge?

A typical challenge lasts 30 days. The purpose is to follow a defined dietary pattern for a limited period and then evaluate your experience.

What do you eat on an animal-based 30-day challenge?

Depending on the version, meals may center on meat, organ meats, eggs, fish, seafood and dairy, with some approaches also including fruit and honey.

Can you eat fruit on an animal-based challenge?

Yes, many animal-based approaches include fruit. This is one of the main differences between animal-based and strict carnivore diets.

Do you have to eat liver?

No. Some protocols emphasize organ meats, but there is no universal rule requiring liver in every animal-based challenge.

Is an animal-based 30-day challenge the same as carnivore?

No. Carnivore diets generally exclude fruit and other plant foods, while many animal-based approaches include fruit and sometimes honey.

Can you lose weight in 30 days?

You may lose weight, but it is not guaranteed. Weight changes depend on factors such as calorie intake, appetite, activity, food choices and water balance.

Are the benefits of an animal-based 30-day challenge scientifically proven?

No. Research specifically testing 30-day animal-based challenges is limited. Evidence from carnivore research also has important limitations and should not automatically be applied to every animal-based diet.

What should you track during the challenge?

Useful measures include body weight, waist circumference, hunger, energy, sleep, digestion, bowel habits, training performance and adherence.

What happens after the 30 days?

Review what changed, what did not, whether you experienced problems, and whether the diet is practical and sustainable before deciding what to do next.

Bottom Line

The Animal-Based 30-Day Challenge is best viewed as a structured, short-term dietary experiment rather than a guaranteed health transformation.

Define your rules before Day 1, establish a baseline, track meaningful measures, and record deviations from the plan. Most importantly, separate personal observations and promotional claims from scientific evidence.

Animal-based diets can differ substantially from one another, and a broader pattern that includes fruit is not the same as a strict carnivore diet. Current evidence for highly restrictive animal-food patterns remains limited, particularly for long-term health outcomes.

A successful 30-day challenge is therefore not simply one that produces a dramatic number on the scale. It is one that gives you useful, honest information about adherence, practicality, dietary response, and what you should consider before continuing the pattern.

Reference

• World Health Organization (WHO): www.who.int
• Centers for Disease Control and Prevention (CDC): www.cdc.gov
• National Institutes of Health (NIH): www.nih.gov
• Harvard T.H. Chan School of Public Health: www.hsph.harvard.edu
• American Heart Association (AHA): www.heart.org
• Academy of Nutrition and Dietetics: www.eatright.org
• The British Nutrition Foundation (BNF): www.nutrition.org.uk
• Dietitians of Canada: www.dietitians.ca
• European Food Information Council (EUFIC): www.eufic.org
• The Mayo Clinic: www.mayoclinic.org
• Cleveland Clinic: www.my.clevelandclinic.org
• Johns Hopkins Medicine: www.hopkinsmedicine.org
• The George Institute for Global Health: www.georgeinstitute.org.au
• United States Department of Agriculture (USDA): www.usda.gov

Disclaimer:

This article is for general educational and informational purposes only and is not intended to provide medical, nutritional, or dietary advice. An animal-based 30-day challenge is a restrictive eating experiment, and individual responses can vary. The information presented does not guarantee weight loss, health improvements, or any specific result. If you are pregnant or breastfeeding, under 18, have a medical condition, take medication, or have a history of disordered eating, consult a qualified healthcare professional before making significant dietary changes. Do not use this article to diagnose, treat, cure, or prevent any disease or to replace advice from your doctor, registered dietitian, or other qualified healthcare professional.