Why Can't I Lose Weight?
- Gut Honest Truth
- Jun 24, 2021
- 5 min read
Updated: 4 days ago
The answer might surprise you...
Welcome to the Gut Honest Truth blog where a Certified Functional Medicine Practitioner gives you digestible information to tackle your chronic health concerns.
That's me, Katie Morra; and in this blog I'm going to share the top 7 reasons I see in clinical practice that may be standing between you and your weight loss goals.
And as always, working one-on-one for your specific needs is always our top recommendation, check out our appointment options to get started with one of our licensed health care professionals today.
Weight loss is a touchy but incredibly common topic. If your goal is weight loss, I support you — the only opinion that matters is your own. But let me offer some professional guidance as a Registered Dietitian and Certified Functional Medicine Practitioner.
Weight loss is far more complex than mainstream media and traditional healthcare would have you believe. Calories in, calories out, exercise, willpower — in my office, that story is almost never the full picture. Here's what I actually see driving stubborn weight in clinical practice.
1. Inflammation
The immune system defends the body against infection by releasing hormones and signaling messengers called cytokines. Acute inflammation is a normal, healthy immune response. Chronic inflammation is the problem.
When your immune system is stuck in a state of chronic activation, it keeps sending out hormones and signals that directly interfere with weight loss. Chronic inflammation can predispose you to fat gain and metabolic imbalance — essentially, it creates an internal environment that makes losing weight extremely difficult, and can actually drive weight gain over time.
You'll notice systemic inflammation is a common thread running through almost every contributor below.
2. Food Sensitivities
Food sensitivities occur when your immune system identifies a specific food as a threat and mounts a response. Unlike food allergies, reactions can occur anywhere from a few hours to 72 hours after eating — making them genuinely difficult to identify without a structured approach.
Long-term exposure to a food you're sensitive to creates ongoing inflammation, which can make weight loss impossible — or actively drive weight gain.
Common symptoms of food sensitivities:
Bloating or abdominal pain
Constipation or diarrhea
Joint pain
Acne or skin rashes
Chronic fatigue or sleep disturbances
Headaches
Common trigger foods: wheat, corn, dairy, eggs, soy, shellfish, beef, pork.
The gold standard for identifying food sensitivities is a proper elimination and reintroduction program — not guessing or cutting things out indefinitely.
3. Thyroid
Your thyroid is your body's central thermostat. It controls how well you digest and absorb food, utilize energy, and store fat. Decreased thyroid function (hypothyroidism) is one of the most common and most missed drivers of stubborn weight.
Thyroid issues get overlooked constantly because most providers only order TSH and T4. That's like looking at the tip of an iceberg and assuming there's nothing underneath. A complete thyroid panel should include TSH, Free T4, Free T3, Reverse T3, and thyroid antibodies.
Optimal ranges also differ between functional and conventional medicine — at GHT we look at how the whole team is performing, not just the captain (TSH).
For more on thyroid testing, check out our post on Understanding Thyroid Lab Markers, or download my How to Put the Fire Out On Your Thyroid e-book.
4. Stress
Stress produces cortisol — a hormone that, in acute situations, is protective and necessary. The problem is chronic cortisol elevation.
When cortisol is continuously oversecreated, it:
Deposits excess fat preferentially in the belly
Stimulates appetite and cravings for calorie-dense foods
Creates a vicious cycle where excess fat tissue reactivates inactive cortisol (cortisone) back into active cortisol — further driving belly fat accumulation
Eliminating stress isn't realistic. But identifying your biggest stressors, improving your stress response, and supporting your adrenal health can make a meaningful difference. A DUTCH Adrenal test is our preferred way to assess how chronic stress is affecting your cortisol rhythm.
5. Gut Health
An impaired gut affects weight in ways most people never consider. Low stomach acid, low enzyme production, and pathogenic overgrowths in the intestinal tract can all cause nutrient deficiencies and metabolic disruption.
Specific gut-weight connections I see regularly in practice:
Methane SIBO — the methanobacter organism can extract excess calories from food and store them as weight on your body
Bacterial overgrowth — too much pathogenic bacteria increases an enzyme called beta-glucuronidase, which can drive estrogen dominance and the weight gain that comes with it
Chronic gut infections — H. pylori, parasites, and candida create persistent inflammation that perpetuates the inflammation-weight gain loop
A GI-MAP stool test is often the most revealing place to start when gut health may be driving stubborn weight.
6. Sex Hormones
Sex hormones are involved in virtually every biological process in the body — including fat storage and metabolism.
Estrogen — plays a direct role in increasing visceral fat (fat around the organs). Excess estrogen drives both aesthetic and health consequences.
Progesterone — vital for hormonal harmony. An imbalance between estrogen and progesterone impairs the body's ability to burn fat for energy, leading to stubborn weight that won't budge.
Testosterone — can be converted into estrogen via the aromatase pathway, meaning you can end up with more estrogen than you originally produced — circling back to the fat storage problem.
Estrogen dominance is worth investigating if hormonal weight gain is a pattern for you. The DUTCH hormone test is our preferred tool for understanding the full hormonal picture.
7. Calories In vs. Calories Out
I'd be remiss not to address this. Understanding caloric intake versus expenditure is genuinely useful — but we are humans, not mathematical equations.
Factors that affect body weight beyond just calories:
Appetite regulation
Non-exercise activity thermogenesis (NEAT) — daily movement that isn't formal exercise
Exercise frequency, intensity, and duration
Food quality and choices
How well you actually absorb what you eat
To calculate your basic caloric needs:
BMR (Basal Metabolic Rate) × Activity Level
BMR formulas:
Women: (10 × weight in kg) + (6.25 × height in cm) - (5 × age) - 161
Men: (10 × weight in kg) + (6.25 × height in cm) - (5 × age) + 5
Activity multipliers:
Sedentary (little/no exercise): × 1.2
Lightly active (1-3 days/week): × 1.375
Moderately active (3-5 days/week): × 1.55
Very active (6-7 days/week): × 1.725
Extra active (physical job + training): × 1.9
But remember — achieving your goal weight requires harmony between your thyroid, food sensitivities, inflammation, stress response, gut health, and hormones. Calories are one piece of a much bigger picture.
Your body is doing its absolute best to protect you. If something isn't responding the way you'd hoped, it's trying to tell you something. Be your own advocate — and know that with the right testing and a targeted approach, most of these drivers are very addressable.
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