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What happens to your body when you start paleo?

3 min read

When you begin the paleo diet, which eliminates processed foods, grains, and dairy, your body undergoes a profound shift. This can lead to a variety of short-term and long-term changes as your system adapts to eating more lean protein, healthy fats, fruits, and vegetables.

Quick Summary

The paleo diet prompts changes from initial flu-like symptoms and water weight loss to long-term shifts in digestion, energy, and inflammation as the body eliminates processed foods and adapts to whole-food sources..

Key Points

  • Initial 'Paleo Flu': The first week can cause fatigue, headaches, and cravings as the body adapts to using fat for energy.

  • Initial Water Weight Loss: Rapid weight loss in the first week is common and primarily water weight.

  • Increased Energy and Clarity: Stable blood sugar levels lead to more consistent energy and reduced brain fog after adjustment.

  • Altered Digestive Function: Increased fiber can cause temporary digestive issues as the gut adapts.

  • Reduced Inflammation: Eliminating processed foods, refined sugars, and unhealthy fats can lower inflammation biomarkers.

  • Potential Nutrient Deficiencies: Careful planning is needed for nutrients like calcium, vitamin D, and fiber due to the elimination of grains and dairy.

In This Article

Navigating the Initial Paleo Transition: The 'Paleo Flu'

For many, the first week of starting the paleo diet can be a challenging period, often nicknamed the “paleo flu”. This is your body's response to the sudden withdrawal of processed foods, refined sugars, and carbohydrates. As your metabolism shifts, you may experience fatigue, headaches, brain fog, and intense cravings. These symptoms typically subside within a week or two as your body adapts. To ease this transition, stay hydrated, ensure enough carbohydrates from paleo-approved sources, and listen to your body.

Short-Term Effects: Quick Wins and Digestive Adjustments

After the initial 'flu' phase, many experience immediate benefits. A rapid drop in weight, especially in the first week, is common and primarily water weight loss from reduced carbohydrate intake. Other positive changes include:

  • Increased Energy and Mental Clarity: Stable blood sugar levels from eliminating high-glycemic foods lead to more consistent energy and clearer thinking.
  • Improved Sleep: Avoiding processed foods that disrupt sleep can lead to better rest.
  • Clearer Skin: Some notice reduced skin inflammation and a clearer complexion.
  • Digestive Changes: Increased fiber from fruits and vegetables may cause initial bloating or gas, which often resolves. Changes in bowel movements are possible, emphasizing balanced intake of diverse plant foods.

Long-Term Remodel: Deeper Physiological Shifts

The long-term impact of the paleo diet influences deeper physiological systems.

Gut Health Dynamics

Long-term adherence significantly alters your gut microbiome. While grains and legumes are excluded, a well-planned diet can provide fiber from plant sources. Concerns exist that long-term elimination of certain groups could negatively impact beneficial gut bacteria. Prioritizing a diverse array of fruits, vegetables, nuts, and seeds is crucial for gut health.

Inflammation and Metabolic Health

The paleo diet is often cited for its anti-inflammatory effects. Removing processed foods, refined sugars, and industrial vegetable oils eliminates pro-inflammatory triggers. Research shows reduced inflammation biomarkers and improvements in blood pressure, cholesterol, and insulin sensitivity.

Paleo vs. Standard Western Diet Comparison

Here's a comparison of key characteristics:

Feature Paleo Diet Standard Western Diet
Food Sources Whole, unprocessed foods: lean meats, fish, vegetables, fruits, nuts, seeds, healthy fats. High intake of processed foods, refined grains, added sugars, dairy, and legumes.
Macronutrient Balance Higher in protein and fat, lower in carbohydrates compared to the Standard Western Diet. Typically high in refined carbs and unhealthy fats; lower in protein and fiber.
Processed Foods Strict elimination. Heavily reliant on highly processed packaged foods.
Inflammatory Potential Anti-inflammatory. Pro-inflammatory.
Nutrient Intake High in vitamins, minerals, and fiber; planning needed for calcium and vitamin D. Often lacking in micronutrients and fiber.
Overall Health Impact Linked to short-term weight loss, improved metabolic markers, reduced inflammation. Associated with higher rates of obesity, diabetes, heart disease.

Conclusion

Starting the paleo diet involves an adaptation period, including the temporary 'paleo flu', leading to improved energy, digestion, and reduced inflammation. Long-term benefits for metabolic function and inflammatory response stem from focusing on whole, unprocessed foods. However, restricting food groups requires careful planning to avoid nutrient deficiencies, particularly calcium and vitamin D. Individual results vary, and consulting a healthcare professional is recommended to ensure nutritional needs are met and mitigate potential risks. The core positive change is the shift away from processed foods towards nutrient-dense options.

For more detailed information, explore resources like The Paleo Diet website.

Frequently Asked Questions

The 'paleo flu' refers to flu-like symptoms like fatigue and headaches during the first week as your body adapts to using fat for fuel. Minimize it by staying hydrated, ensuring adequate paleo carbohydrate intake, and avoiding excessive restriction initially.

Many experience weight loss, especially initially, due to water loss and the elimination of calorie-dense processed foods.

Initially, energy may dip. After adaptation, many report more stable energy without the spikes and crashes from high-sugar foods.

Yes, it eliminates many pro-inflammatory triggers found in processed foods and refined sugars, potentially reducing inflammation biomarkers.

The diet can alter gut bacteria. While diverse fruits and vegetables are beneficial, eliminating grains and legumes removes fiber sources, requiring conscious effort to maintain diverse plant intake.

Pay attention to calcium, vitamin D, and fiber intake due to the elimination of dairy, grains, and legumes. Source these from paleo-friendly options.

Studies suggest it can help manage blood pressure, cholesterol, and triglycerides, linked to reduced processed foods, sugar, and salt.

References

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Medical Disclaimer

This content is for informational purposes only and should not replace professional medical advice.