Habits and Hustle

Episode 523: Ashley Koff, RD: GLP-1, Weight Loss and the Mistakes That Create Rebound

January 27, 2026

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  • GLP-1 medications are biosimilar hormone replacements that keep the body in a metabolically active state, which can lead to fatigue and reduced heart rate variability if not managed with proper considerations. 
  • Weight loss should not be the primary goal; instead, focus should be on addressing the root causes of excess fat storage, muscle loss, and metabolic issues. 
  • Optimal digestion and hydration form the non-negotiable foundation (the 'crust' of the pizza) for achieving any positive health outcome, regardless of whether GLP-1 medication is used. 
  • Genetic or gut testing results should not be acted upon without interpretation from a clinician trained in the specific test, as underlying issues like insufficient glutamine intake or poor lifestyle choices often drive the results. 
  • Alcohol consumption is highly detrimental to weight health and overall health programs because it erodes the digestive lining and impairs liver function. 
  • Over-reliance on extensive biomarker testing (e.g., 500 biomarkers) without addressing fundamental issues like nutrient absorption is excessive, costly, and often less informative than a thorough patient history and targeted assessment. 
  • Glutamine is becoming an essential nutrient due to modern stressors that challenge muscle and the digestive tract lining, making it a foundational supplement for nutrient absorption before adding other nutrients. 
  • Stress, high sugar intake, alcohol, and caffeine are significant dehydrators, impacting the body's ability to absorb water and nutrients effectively. 

Segments

GLP-1s as Hormone Replacement
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(00:03:45)
  • Key Takeaway: GLP-1 medications function as biosimilar hormone replacements that keep the body in a prolonged, metabolically active state.
  • Summary: GLP-1s mimic natural weight health hormones like GLP-1, but remain active for 24 hours or seven days compared to the body’s natural two to five minutes. This prolonged activity can delay gastric emptying and keep insulin signaling active, potentially preventing the body from entering recovery mode. This sustained activation can lead to measurable decreases in heart rate variability and increased fatigue.
Weight Loss vs. Health Goal
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(00:06:23)
  • Key Takeaway: The goal should be addressing root causes of fat storage, not simply losing weight, as medication used as a sole solution creates problems.
  • Summary: Prescribing medication solely for weight loss operates within an outdated system; the focus must shift to why the body is creating excess fat or struggling with muscle mass. Using GLP-1s as a tool requires understanding their mechanism and optimizing surrounding factors. Relying only on the medication without addressing underlying issues prevents true weight health.
Bias Against Weight-Related Medication
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(00:08:31)
  • Key Takeaway: Societal bias against weight management leads to unfair judgment of GLP-1 use compared to other common medications like statins or PPIs.
  • Summary: Clinicians observe significant bias when patients use weight-related medications, unlike when they use medications for acid suppression or cholesterol management. Appearance does not indicate internal health status, and GLP-1s may be useful tools for conditions like disordered eating or blood sugar dysregulation, not just for cosmetic weight loss. Misuse, however, can exacerbate existing issues like poor sleep or nutrient insufficiency.
Rebound Weight Gain Mechanism
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(00:12:00)
  • Key Takeaway: Stopping GLP-1s often results in rapid weight regain, frequently exceeding the initial weight, due to lost muscle mass and a rebounding appetite.
  • Summary: When individuals acclimate to the medication and their appetite returns, they face the choice of indefinite use or weight regain. Because muscle mass is often lost while on the drug, stopping use leaves the body metabolically disadvantaged when appetite returns intensely. Behavior modification must accompany medication use to prevent this rebound effect.
Personalized Approach to Health
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(00:14:48)
  • Key Takeaway: Expecting identical outcomes by following someone else’s protocol, regardless of their expertise, is fundamentally flawed; health management must be an ongoing experiment.
  • Summary: Effective health strategies require an experimental approach where data is gathered from the individual’s response to interventions, rather than blindly following another person’s regimen. The speaker details years of trying various behavior modifications (fasting, veganism, high fiber) before finding what worked for her specific physiology. Clinicians should use patient data to pivot recommendations rather than labeling patients as non-compliant.
GLP-1 Receptor Agonist Types
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(00:28:11)
  • Key Takeaway: GLP-1 medications differ based on the number of receptors they activate: single, dual, or triple agonists targeting different hormones.
  • Summary: Semaglutide is a single agonist for GLP-1, while Tirzepatide is a dual agonist for GLP-1 and GIP. Retatrutide is a triple agonist, also working on a different glucose hormone receptor. Newer non-peptide oral agonists may skip the initial receptor pocket, leading to unknown long-term effects compared to the established peptide agonists.
Foundational Pillars of Health Optimization
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(00:34:41)
  • Key Takeaway: Achieving health goals relies on optimizing digestion/hydration (crust), nutrition quality/timing (sauce), and lifestyle choices (cheese), independent of GLP-1 use.
  • Summary: Digestion and hydration are the essential base layer; no health outcome can be achieved if the body cannot absorb nutrients. Better nutrition involves balancing quantity, quality, timing, and balance, emphasizing regular ‘pit stops’ rather than prolonged fasting for most people. Lifestyle choices include movement that stresses the body appropriately (not just 30 minutes daily) and managing stress to allow for digestive recovery.
Protein Intake and Digestive Load
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(00:41:45)
  • Key Takeaway: Excessive protein intake, especially based on body weight formulas, can strain digestion and negatively impact blood sugar if absorption is suboptimal.
  • Summary: Consuming protein amounts calculated as one gram per pound of body weight is often too high for individuals over 150 pounds and requires optimal digestion. Signs of excessive protein include bloating, gas, reflux, or constipation, indicating the body cannot break down the load. Since no food in nature is only protein, starting meals with pure protein sources bypasses the natural balance of macronutrients.
Assessing and Supporting Absorption
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(00:49:49)
  • Key Takeaway: Absorption must be regularly assessed, ideally quarterly, as factors like antibiotics, stress, and environmental toxins constantly compromise the digestive lining.
  • Summary: The body only benefits from food once it is broken down into usable nutrients within the cells, making absorption critical. Assessment can involve specialized tests or recognizing persistent digestive issues like constipation, which may indicate poor motility rather than just low fiber intake. Insufficient glutamine intake and lifestyle behaviors are common causes of poor absorption that require clinical interpretation of test results.
Advanced Gut Testing Methods
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(00:51:17)
  • Key Takeaway: Modern full-spectrum genetic testing allows for simpler sample collection (swipes) compared to older methods requiring stool tubes.
  • Summary: Gut testing has evolved from analyzing stool in tubes to simpler methods like swiping samples, which provide extensive information. Relying solely on AI-generated reports from these tests without clinical interpretation is ineffective. Clinicians are needed to understand the ‘why’ behind imbalances, often pointing to insufficient glutamine or poor lifestyle choices affecting absorption.
Alcohol’s Negative Impact on Health
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(00:52:33)
  • Key Takeaway: Alcohol consumption actively erodes the digestive lining and hinders the liver’s ability to function optimally, counteracting weight health efforts.
  • Summary: The speaker views alcohol as one of the worst things for any health or weight loss program due to its negative effects on the digestive tract lining. Drinking can also serve as a social coping mechanism, leading to staying longer in undesirable situations or leaning into other poor behaviors. Eliminating alcohol is crucial for maintaining digestive integrity and overall metabolic health.
Momentous Supplement Routine
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(00:54:08)
  • Key Takeaway: The Momentous Three—protein, creatine, and Omega-3—are key nutrients for long-term health and performance that are often difficult to obtain sufficiently through diet alone.
  • Summary: The combination of CreaPure Creatine, grass-fed whey protein, and Omega-3 is highlighted for boosting physical/mental performance and improving recovery. These nutrients are essential for overall well-being when diet falls short. A discount code is provided for listeners to try the subscription.
Therasage Red Light Therapy Benefits
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(00:55:17)
  • Key Takeaway: Portable red light therapy panels are effective tools for reducing inflammation, alleviating pain, and providing anti-aging benefits like reducing facial fine lines.
  • Summary: The Tri-Light panel is a portable biohacking tool used for healing the body by reducing inflammation and pain in targeted areas like the back or joints. It also offers cosmetic benefits by reducing signs of aging on the face. The product is described as small, affordable, portable, and effective.
Immune System Location Debate
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(00:56:38)
  • Key Takeaway: While the immune system is physiologically present in the gut lining, the body functions as a single ecosystem, making the segmentation into separate systems (digestive, immune) counterproductive for healthcare.
  • Summary: The speaker disagrees with the polarizing claim that the immune system resides only in the blood, asserting that the gut lining is physiologically critical to immunity. The concept of separate systems (digestive, immune, etc.) is deemed an outdated simplification that segments healthcare delivery poorly. Over-testing, such as excessive blood draws, can strip the body’s resources.
Critique of Excessive Biomarker Testing
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(00:58:47)
  • Key Takeaway: Testing an ever-increasing number of biomarkers (e.g., 500 tests) often serves as a marketing differentiation point rather than a necessity for healing, especially if absorption issues are not addressed.
  • Summary: There is a trend toward excessive biomarker testing, which wastes time, money, and blood if the underlying issue of nutrient absorption is ignored. Traditional medical approaches often look at isolated markers (like low iron) and recommend supplements without investigating root causes like testosterone levels. If nutrient absorption is poor, improving markers through testing alone is futile.
Essential Weight Health Biomarkers
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(01:03:28)
  • Key Takeaway: Ten key biomarkers for weight health assessment include Hemoglobin A1C, Vitamin D, LDL, Triglycerides, Fasting Insulin, HSCRP, ALT, and AST, used directionally alongside lived experience.
  • Summary: The ten labs provide directional information regarding weight health hormones and inflammation, though A1C is noted as a limited 90-day average. Elevated ALT and AST signal potential liver struggles, which must be addressed even in healthy-weight individuals. These labs are only one component, balanced with body composition, digestion, hydration, and heart rate variability assessments.
Improving Nutrient Absorption
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(01:05:17)
  • Key Takeaway: Optimizing nutrient absorption involves consuming appropriate food quantities, maintaining consistent hydration with electrolytes, and ensuring regular physical activity.
  • Summary: The body cannot absorb nutrients effectively if overloaded, so smaller, consistent intakes are better than large amounts at once. Hydration should be optimized by sipping water rich in electrolytes rather than chugging large volumes, while avoiding dehydrators like alcohol or caffeine simultaneously. Inactivity signals the body to store nutrients as fat rather than absorb them for use.
Factors Challenging Digestive Health
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(01:06:22)
  • Key Takeaway: Oral contraceptives challenge the digestive tract lining and nutrient absorption, and the probiotic Akkermansia muciniphila aids repair by stimulating new mucus creation.
  • Summary: Birth control pills can negatively affect the digestive tract lining and deplete necessary nutrients required for absorption. Akkermansia muciniphila is beneficial because it consumes old mucus, forcing the body to generate new, healthy lining tissue. Glutamine is conditionally essential in modern life, acting as the ‘glue’ for the digestive tract lining and supporting muscle repair.
Supplement Quality and Capsule Concerns
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(01:08:52)
  • Key Takeaway: When selecting supplements, the material of the capsule itself (e.g., gelatin vs. veggie capsule like Pullulan) should be scrutinized, as some materials can impact absorption or contain unwanted substances.
  • Summary: Glutamine is highly recommended, preferably in powdered form over capsules to avoid concerns about capsule composition. While some newer capsules use natural materials like Pullulan from seaweed, buyers should investigate what the capsule shell is made of. Reputable brands that offer third-party testing, like Momentous, are preferred over buying supplements randomly on platforms like Amazon.
Hydration and Electrolyte Balance Nuances
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(01:10:49)
  • Key Takeaway: Effective hydration depends on recognizing if one is a ‘hose’ or ‘sponge,’ managing exposure to dehydrators like stress and sugar, and ensuring adequate intake of key minerals like potassium and sodium.
  • Summary: Stress and elevated blood sugar are identified as dehydrators alongside alcohol and caffeine, which interfere with water absorption. Supplementing sodium based on generalized advice (like from podcasts) without considering individual sweat loss and diet is inappropriate. Potassium intake is often insufficient, and while supplementation is needed, high doses should be avoided.
Avoiding Health Obsession and Over-Testing
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(01:13:55)
  • Key Takeaway: Hyper-focus on longevity trends, wearables, and excessive testing leads to ‘infobesity’ and stress, which is counterproductive to actual healing and well-being.
  • Summary: Trying to replicate the exact diet or routine of an influencer will not yield the same results due to individual biological differences. The stress from obsessive tracking (glucose monitors, sleep trackers) can negate health benefits, making people feel they cannot be healthy without expensive tools. Simple, actionable steps, like assessing sweet taste buds with an apple, are often more valuable than hundreds of lab tests.
Timing Lab Tests for Accuracy
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(01:17:29)
  • Key Takeaway: Before investing in blood or gut testing, allow the body at least one month of dedicated recovery, good nutrition, and supplementation (like glutamine) to ensure lab results reflect a healed state, not a stressed state.
  • Summary: If the body has recently undergone significant stress, travel, or health issues, lab tests will reflect this depleted state and lead to expensive, potentially unnecessary recommendations. A 30-day tune-up period before testing ensures the body has the resources needed to run better. Taking foundational supplements like glutamine for four weeks prior to blood work is a recommended preparatory step.