# Exploring the Immunological Shield Hypothesis: A Population-Based Exploration of Phenotypic Divergence Between Lipedema and Celiac Disease Autoimmunity

## TL;DR

This study explores if a specific fat distribution in women, similar to lipedema, may protect against celiac disease autoimmunity by comparing metabolic and immunological profiles in a large population.

## Contribution

The study introduces the 'Immunological Shield Hypothesis' and explores a potential protective role of gluteofemoral fat against Th1-mediated autoimmunity using a population-based approach.

## Key findings

- Women with celiac disease had 7.4% lower gynoid fat compared to those without, even in overweight/obese groups.
- The lipedema-like phenotype showed 44.2% lower insulin resistance and 7.6% lower NLR, indicating better metabolic health.
- The study suggests biological plausibility for the Immunological Shield Hypothesis but notes the need for larger cohorts to confirm findings.

## Abstract

Background

Lipedema is characterized by disproportionate gluteofemoral adiposity with anti-inflammatory properties. We hypothesized that this phenotype may confer immunological protection against T-helper 1 (Th1)-mediated autoimmunity ("Immunological Shield Hypothesis").

Objective

The objective of this study is to explore whether women with a dual-energy X-ray absorptiometry (DXA)-defined lipedema-like phenotype, characterized by disproportionate gluteofemoral fat accumulation, exhibit distinct immunometabolic profiles and lower prevalence of celiac disease (CD) autoimmunity in a nationally representative sample.

Methods

The cross-sectional analysis included 3,833 women from the National Health and Nutrition Examination Survey (NHANES) 2011-2014. Celiac disease (n=11, 0.56% weighted prevalence) was defined by strict serology (tissue transglutaminase {tTG}-IgA+/endomysial antibody {EMA}-IgA+); lipedema phenotype was defined as leg-to-trunk fat ratio of >90th percentile via DXA.

Results

Women with celiac disease exhibited 7.4% lower gynoid fat (39.5% versus 42.6%, p=0.0007), persisting in overweight/obese strata. Conversely, the lipedema phenotype demonstrated superior metabolic health: 44.2% lower homeostatic model assessment of insulin resistance (HOMA-IR) (p<0.001) and 7.6% lower neutrophil-to-lymphocyte ratio (NLR) (p=0.012).

Conclusions

This exploratory population-based analysis identifies phenotypic divergence in fat distribution between the DXA-defined lipedema phenotype and celiac disease autoimmunity, yielding observations consistent with, but not confirmatory of, the "Immunological Shield Hypothesis." While limited by the small number of celiac cases (n=11), a sample size insufficient to detect prevalence differences for a ~7%-9% phenotype, for which approximately 225-600 celiac cases would be required, the observed differences in gynoid adiposity (7.4% reduction, p=0.0007) and the favorable metabolic profile of the lipedema phenotype (44.2% lower HOMA-IR and 7.6% lower NLR) suggest biological plausibility warranting validation in larger, targeted cohorts. These findings motivate targeted studies to evaluate whether dietary exposures, including gluten-related immune activation, interact with gluteofemoral adipose biology in lipedema.