Why is the weight not coming off, no matter what I try?

What's actually driving stubborn weight gain?

Several patterns show up repeatedly in resistant weight presentations, and they often co-occur:

• Insulin resistance. Cells become less responsive to insulin, the pancreas produces more, and elevated insulin promotes fat storage while inhibiting fat release. The most common single driver, often present years before glucose abnormalities appear
• Subclinical hypothyroidism. TSH in the upper-normal range (2.5 to 4.5 mIU/L), or free T3 in the low-normal range, or elevated thyroid antibodies. Metabolic rate slows, and weight loss becomes disproportionately difficult
• Cortisol dysregulation. Chronic stress patterns drive central fat deposition, increase appetite for sugar and refined carbohydrates, and impair insulin sensitivity at the same time
• Estrogen dominance. Relative excess of estrogen versus progesterone, common in perimenopause and PCOS, drives lower-body fat storage and water retention
• Low testosterone in both men and women. Reduces muscle mass, lowers metabolic rate, and increases fat storage. The decline in men is often missed because total testosterone can stay in range while free testosterone falls
• Chronic inflammation. Elevated hs-CRP (a general inflammation marker) and inflammatory cytokines correlate with insulin resistance, leptin resistance, and increased fat mass
• Sleep deprivation. Even one night of poor sleep increases ghrelin (the hunger hormone), decreases leptin (the satiety hormone), worsens insulin sensitivity, and increases cortisol output

Is leptin resistance part of this?

Leptin resistance is an underrecognized contributor in chronic excess weight. Leptin is the hormone produced by fat cells that tells the brain you've had enough to eat. In sustained excess weight, leptin levels rise but the brain stops responding to leptin's signal. The body acts as if it's underfed regardless of actual intake, breaking the appetite-regulation loop.

Restoring leptin sensitivity typically requires addressing insulin resistance and inflammation in parallel, since both impair leptin signaling. Direct leptin supplementation doesn't work because the issue is receptor responsiveness, not leptin levels.

Does the gut microbiome affect weight?

The gut microbiome influences weight through several mechanisms: variation in calorie extraction efficiency from the same dietary intake, short-chain fatty acid production (which affects metabolism), regulation of appetite hormones, and modulation of systemic inflammation.

Specific bacterial profiles correlate with metabolic health and disease, though the field is still mapping which interventions reliably shift composition in ways that produce meaningful weight outcomes. The gut matters; the prescribed protocols are still being developed.

What medications might be making it worse?

Medications worth reviewing in any stubborn weight workup:

• Antidepressants (SSRIs, SNRIs, tricyclics)
• Atypical antipsychotics (olanzapine, quetiapine, risperidone)
• Beta-blockers (especially older ones like atenolol)
• Certain combined oral contraceptives
• Gabapentinoids (gabapentin, pregabalin)
• Older-generation antihistamines (diphenhydramine and similar)
• Corticosteroids (oral, inhaled at high doses, or repeated injections)
• Some diabetes medications (insulin, sulfonylureas)

Adjustment isn't always possible (some of these treat conditions that can't be left untreated), but reviewing the medication list often reveals contributors that hadn't been considered.

What labs reveal what's actually happening?

A useful workup for stubborn weight includes:

• Fasting insulin and HOMA-IR for early-stage insulin resistance
• Full thyroid panel with antibodies and reverse T3
• Sex hormones with SHBG (sex hormone binding globulin)
• DHEA-S (an adrenal hormone reflecting overall adrenal output)
• Four-point cortisol or comprehensive cortisol metabolite testing
• hs-CRP (a general inflammation marker)
• Leptin and adiponectin
• Vitamin D, ferritin (the iron storage marker)
• Lipid panel including ApoB and the triglyceride-to-HDL ratio
• ALT (a liver enzyme that often rises early in metabolic dysfunction)

The pattern across multiple markers is more informative than any single value.

What's the actual treatment framework?

The clinical approach: identify the dominant drivers through testing, address them in priority order, support metabolic flexibility through nutrition and movement, consider medical adjuncts (GLP-1 medications, metformin, hormone optimization, low-dose naltrexone in some cases) when clinically appropriate, and monitor body composition rather than scale weight alone.

Order matters. Treating thyroid dysfunction without addressing cortisol patterns rarely produces lasting results because cortisol affects thyroid hormone conversion. Addressing insulin resistance without supporting muscle building loses lean mass along with fat. The sequencing is part of what makes the work clinical rather than protocol-driven.

The deeper picture

Stubborn weight is one of the clearest examples of where personalized investigation changes outcomes. The drivers are different in different people, and identifying the right ones in the right order is what makes a plan work. Dr. Paul builds individualized plans based on each patient's full picture.