Behind the Scenes Causes of Weight Loss Resistance
- Mary Kate Fuller, MS, CNS, LDN, CHHP

- Mar 7, 2022
- 4 min read
Updated: Jun 23
Why the Scale Isn’t Moving—And What to Do About It
If you’ve hit a frustrating plateau—despite your best efforts—there may be deeper root causes behind your weight loss resistance. From hormone imbalances to gut health issues, this guide outlines the most common clinical reasons your body may be holding on to extra weight and what you can do to support natural, sustainable fat loss.
1. Nutrition Habits: What, When & How You Eat Matters
Let’s start with the basics. The foods you eat—and the timing and environment in which you eat them—make a major impact.
What you eat: Processed foods, refined sugars, artificial additives, seed oils, and pesticide-laden produce stress the liver, disrupt the gut, spike blood sugar, and ultimately slow down metabolism. Prioritize whole, nutrient-dense foods instead.
When you eat: Chaotic eating patterns create stress. Eating at regular times each day supports blood sugar balance, digestive enzyme secretion, and cortisol regulation.
How you eat: Eating in a relaxed state, chewing thoroughly, and stepping away from screens helps your nervous system shift into "rest and digest" mode—essential for proper digestion and nutrient absorption.
Tip: Skipping meals or under-eating can backfire by pushing the body into “starvation mode,” triggering a metabolic slowdown and increased fat storage.
2. Thyroid Function & Metabolism
An underperforming thyroid is a major roadblock to weight loss. The thyroid regulates basal metabolic rate, and when it’s sluggish, everything slows—including calorie burn, fat metabolism, and energy.
Consider a full thyroid panel that includes TSH, Free T3, Free T4, Reverse T3, and thyroid antibodies—not just TSH alone.
Supportive nutrients:
Iodine (seaweed, iodized salt)
Selenium (Brazil nuts, sardines)
Tyrosine (poultry, eggs)
Zinc, copper, B vitamins, A, C, and E
Read more on Thyroid Support.
3. Hormone Imbalance: Sex & Stress Hormones
Hormones act as the master regulators of weight. Imbalances in estrogen, progesterone, testosterone, or cortisol can sabotage even the cleanest diet.
Chronic stress → elevated cortisol → insulin resistance and abdominal fat storage
Low estrogen or progesterone → sleep disruptions, cravings, and metabolic changes
Testosterone imbalance → reduced muscle mass and slower metabolism
Consider functional testing to check in on your adrenals and sex hormone health if weight loss feels impossible despite effort.
Learn about Adrenal Support.
4. Poor Digestion = Poor Nutrient Absorption
Even if you eat well, you won’t benefit from your food if you aren’t properly breaking it down. Low stomach acid, sluggish bile flow, enzyme deficiencies, or gut inflammation can prevent nutrient absorption, disrupt satiety signaling, and contribute to bloating and weight retention.
Support digestion with:
Digestive enzymes
Bitter herbs (dandelion, gentian)
Chewing thoroughly
Eating mindfully
Apple cider vinegar or lemon water before meals
Optimize your digestion HERE.
5. Dysbiosis: An Imbalanced Microbiome
Your gut bacteria influence hunger, cravings, insulin sensitivity, and how many calories your body extracts from food.
Overgrowth of pathogenic bacteria or yeast (like Candida) can:
Spike cravings for sugar and refined carbs
Trigger inflammation
Promote fat storage
Disrupt metabolism via endotoxin release
Probiotic-rich foods and targeted gut protocols may be necessary to rebalance your flora.
Learn more about Gut Health.
6. Leaky Gut (Increased Intestinal Permeability)
When the gut lining is compromised, partially digested food particles and toxins can leak into the bloodstream, triggering chronic inflammation and immune overactivation.
This can lead to:
Food sensitivities
Autoimmune flare-ups
Fatigue, bloating, and weight gain
Hormonal and thyroid dysregulation
Heal your gut by removing triggers, adding anti-inflammatory foods, and using gut-repairing nutrients like L-glutamine, collagen, zinc carnosine, and aloe.
Learn more about Leaky Gut.
7. Chronic Inflammation
Inflammation = a weight loss killer.
Low-grade, systemic inflammation tells your body it’s in danger and must conserve energy, store fat, and halt fat burning. Sources of inflammation include:
Refined sugars and seed oils
Processed foods
Mold or chemical exposure
Infections
Gut imbalances
Poor sleep or unmanaged stress
Focus on an anti-inflammatory lifestyle rooted in clean eating, movement, quality sleep, and stress reduction.
TIP: Give your body a break and support with the Elimination Meal Plan.
8. Sluggish Liver & Detoxification
Your liver is your metabolic powerhouse. It processes hormones, toxins, and excess fat-soluble compounds. A sluggish liver = hormone buildup, toxin recirculation, low energy, and weight loss resistance.
Support detox by:
Hydrating well
Eating cruciferous vegetables and bitter greens
Using castor oil packs
Limiting alcohol
Supporting with nutrients like B vitamins, glutathione, NAC, and milk thistle
Read more on Toxic Burden & Detox Support.
9. Blood Sugar Imbalance
Unstable blood sugar leads to insulin spikes—one of the fastest ways to stop fat loss and store belly fat.
To stabilize blood sugar:
Start meals with protein
Include healthy fats and fiber
Avoid refined carbs and sugary snacks
Eat at consistent times throughout the day
Balance carbs with protein and fat
Learn more about Blood Sugar & Weight Loss.
10. Nutrient Deficiencies
Micronutrients are essential for all metabolic processes. Without adequate levels of B vitamins, magnesium, zinc, iron, iodine, and omega-3s, your metabolism slows down, hormones falter, and fat-burning becomes inefficient.
Use a tracker like Cronometer to assess your nutrient intake
Consider testing or reviewing clinical signs with us (brittle nails, dry skin, hair thinning)
Self-assess Nutrient Deficiencies.
11. Poor Sleep Quality
We burn the most fat while sleeping—especially deep sleep. Poor sleep increases ghrelin (hunger hormone), decreases leptin (satiety hormone), and raises cortisol.
Tips for better sleep:
Go to bed and wake up around the same time daily
Limit blue light exposure at night
Try magnesium, herbal teas, or calming adaptogens
Prioritize sleep just like nutrition and movement
TIP: Optimize your sleep.
Final Thoughts: Safety, Nourishment & Balance
Your body will only release weight when it feels safe. If it's under constant stress—physically or emotionally—it will hold on to fat as protection.
Real, sustainable weight loss comes from:
Deep nourishment
Balanced blood sugar
Hormonal harmony
A healthy gut
Supportive lifestyle practices
If you’re feeling stuck, let’s get to the root cause together.
Book a Free 15-Minute Consultation to explore how functional testing and a personalized nutrition plan can help you break through your plateau.
Your body isn’t broken—it’s speaking. We’re here to help you listen.
Consider Our Functional Weight Loss Program
for More Support and Guidance!










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