Visceral Fat Storage and Your Genetics

By the ExomeDNA Research Team

Visceral fat storage refers specifically to adipose tissue deposited around and between internal organs in the abdominal cavity, as distinct from subcutaneous fat stored beneath the skin. Visceral fat adjusted for BMI captures this fat depot independently of total body weight — in other words, it measures where fat is stored rather than simply how much total fat exists. Multiple genome-wide studies have identified genetic loci that influence visceral fat accumulation independently of general adiposity, including genes involved in extracellular matrix remodeling, glycoprotein biology, and neuronal signaling. This page examines what those genetic signals suggest about the biology of deep fat distribution.

What is visceral fat storage?

Visceral fat, sometimes called deep abdominal fat or organ fat, sits in the mesentery and omentum and surrounds organs including the liver, pancreas, and intestines. Unlike subcutaneous fat, visceral fat is metabolically active in ways that are directly linked to systemic inflammation, insulin sensitivity, and lipid metabolism. Two people with identical BMI readings can have substantially different visceral fat levels, and the person with higher visceral fat will typically exhibit different metabolic markers than the person with equivalent total weight but lower visceral fat.

Research base: Robust.

The genetic architecture of visceral fat, particularly when studied independently of BMI, reveals loci that influence fat distribution rather than fat amount. This is a biologically meaningful distinction: it captures genetic tendencies toward central versus peripheral fat deposition, a distinction with established relevance to cardiometabolic biology.

The genetics of fat distribution, independent of total weight

Studying visceral fat adjusted for BMI requires a statistical approach that controls for overall adiposity, isolating variants associated with fat partitioning. Three landmark studies have contributed to the genetic map for this phenotype.

Fox et al. (2012) conducted a genome-wide association study for abdominal subcutaneous and visceral adipose tissue in women and identified a novel locus for visceral fat, demonstrating that genetic influences on deep fat depots can be detected even in modest sample sizes when phenotyping is precise (Fox et al., 2012). Sung et al. (2016) examined sex-specific loci for abdominal and visceral fat across discovery and replication cohorts, finding genome-wide significant signals for visceral adipose tissue and noting that genetic effects on fat distribution can differ between men and women (Sung et al., 2016). Chu et al. (2017) conducted a multiethnic meta-analysis of ectopic fat depots and identified loci associated with adipocyte development and differentiation, connecting fat distribution genetics to the biology of how fat cells themselves form and mature (Chu et al., 2017).

Key genes: ADAMTS2, ADAMTS9, CLSTN2, and adipose tissue biology

ADAMTS2 and ADAMTS9 are both members of the ADAMTS family of metalloproteinases — enzymes that cleave components of the extracellular matrix. ADAMTS2 specializes in processing procollagen types I, II, and III into mature collagen fibers, making it central to the assembly of connective tissue scaffolding. Adipose tissue is embedded in a collagenous matrix, and the capacity for that matrix to expand or contract affects how fat cells accumulate and remodel. ADAMTS9 similarly remodels proteoglycans in the extracellular matrix, contributing to tissue architecture around fat depots.

CLSTN2 encodes calsyntenin-2, a calcium-sensing transmembrane protein expressed at synapses, particularly in the brain. Its presence in a visceral fat genetics study reflects the growing evidence that central nervous system circuits play a role not just in total energy intake but in where fat is deposited. Hypothalamic and autonomic nervous system pathways regulate adipose tissue lipolysis and lipogenesis in a depot-specific manner, and CLSTN2's synaptic function may contribute to those regulatory circuits.

DCLK2 (doublecortin-like kinase 2) is a serine/threonine kinase involved in neuronal migration and differentiation. Like CLSTN2, its appearance in this fat distribution gene set points toward neural contributions to adipose depot biology. DTX1 encodes deltex E3 ubiquitin ligase 1, a regulator of the Notch signaling pathway; Notch signals control the commitment of mesenchymal stem cells toward adipocyte versus other lineages, making DTX1 a biologically plausible participant in fat cell development and distribution.

C1GALT1 encodes the enzyme responsible for core 1 O-glycosylation, a fundamental step in the synthesis of mucin-type O-glycans on many secreted and membrane-bound proteins including adipokines. Alterations in glycosylation can modify the binding and activity of adipose-tissue-derived signals relevant to insulin sensitivity and fat distribution.

What the research says

The convergent evidence from three independent studies establishes visceral fat adjusted for BMI as a phenotype with a distinctive and identifiable genetic architecture separate from overall adiposity.

Stat block: Fox et al. (2012) identified a novel locus for visceral fat in women through genome-wide association, establishing that visceral fat has genetic determinants distinguishable from those of total body weight and that sex-specific analyses can uncover signals missed in pooled studies (Fox et al., 2012).

Sung et al. (2016) contributed evidence for sex-specific genetic effects on abdominal fat distribution, finding genome-wide significant loci for visceral adipose tissue in cohorts of European ancestry, with replication supporting the distinctiveness of visceral fat genetics from general weight genetics (Sung et al., 2016).

Stat block: Chu et al. (2017) conducted a multiethnic meta-analysis connecting ectopic fat depot genetics to adipocyte development and differentiation pathways, providing a biological framework for understanding how genetic variation influences not just the amount of visceral fat but the biology of the fat cells that form it (Chu et al., 2017).

Clinically, the distinction between visceral and subcutaneous fat is well established: visceral fat secretes pro-inflammatory cytokines and adipokines at higher rates, is more closely linked to insulin resistance and type 2 diabetes, and is associated with elevated cardiovascular metabolic markers independent of total body weight.

How visceral fat genetics affects you

Genetic variants in ADAMTS2, ADAMTS9, and related genes may influence how the extracellular matrix of adipose depots is organized, which in turn affects the capacity of visceral adipose tissue to expand, contract, and remodel. Variants in Notch pathway genes like DTX1 and in neural signaling genes like CLSTN2 may affect whether fat preferentially distributes toward visceral or subcutaneous depots at the cellular and circuit levels.

These genetic tendencies describe fat distribution patterns that can operate independently of total caloric intake or body weight. A person with variants predisposing to higher visceral fat for a given BMI may accumulate more metabolically active deep fat even at the same overall weight as someone without those variants. This is important context for understanding why BMI alone does not fully capture cardiometabolic profile.

Crucially, visceral fat is more metabolically responsive than subcutaneous fat: it is more readily mobilized in response to caloric deficit and exercise, which means it is also among the fat depots most responsive to targeted lifestyle intervention.

Working with your visceral fat genetic profile

The metabolic activity and relative responsiveness of visceral fat to lifestyle inputs means that genetic predispositions in this category are among the more tractable targets for behavioral modification.

Practical starting points:

• Prioritize aerobic exercise, which preferentially reduces visceral fat relative to subcutaneous fat even when total weight change is modest; this effect is consistent across multiple clinical trials
• Dietary patterns that reduce refined carbohydrate intake are associated with disproportionate visceral fat reduction relative to overall fat loss
• Sleep duration and quality are independently associated with visceral fat accumulation; poor sleep elevates cortisol, which promotes visceral depot lipogenesis
• Manage chronic psychological stress, as cortisol directly promotes visceral fat storage through glucocorticoid receptor activation in abdominal adipocytes
• Consider discussing visceral fat measurement directly with a healthcare provider if you carry variants in this gene set, as waist circumference or imaging-based assessments provide information that BMI alone cannot

Frequently asked questions

Q: What makes visceral fat different from subcutaneous fat? A: Visceral fat is stored around internal organs in the abdominal cavity, whereas subcutaneous fat is stored beneath the skin. Visceral fat is metabolically more active, secreting pro-inflammatory cytokines at higher rates and being more closely linked to insulin resistance and cardiometabolic risk markers than subcutaneous fat at the same total quantity.

Q: Why is it meaningful to study visceral fat adjusted for BMI? A: Adjusting for BMI isolates the genetics of fat distribution from the genetics of total fat amount. Two people at the same BMI can have very different visceral fat levels, and their metabolic profiles may differ accordingly. Studying visceral fat adjusted for BMI identifies variants that specifically influence where fat is stored rather than simply how much total fat exists.

Q: What do ADAMTS2 and ADAMTS9 do in adipose tissue? A: Both genes encode metalloproteinases that remodel the extracellular matrix, the collagenous structural framework in which fat cells sit. ADAMTS2 processes procollagen into mature collagen fibers, while ADAMTS9 cleaves matrix proteoglycans. These remodeling activities affect the capacity of adipose tissue to expand and restructure, which may influence how visceral fat depots develop and store fat.

Q: Is high visceral fat genetics reversible through lifestyle? A: Genetic variants do not change, but visceral fat itself is highly responsive to lifestyle inputs. Aerobic exercise and dietary pattern adjustments preferentially reduce visceral fat relative to subcutaneous fat, and this responsiveness makes visceral fat one of the more tractable fat compartments for intervention regardless of genetic predisposition.

Q: How does CLSTN2, a neuronal gene, end up in a visceral fat study? A: The nervous system plays a direct role in regulating where fat is deposited through autonomic pathways that control adipose tissue lipolysis and lipogenesis in a depot-specific manner. CLSTN2's role in synaptic calcium sensing in the brain may contribute to these neural regulatory circuits, reflecting the broader connection between central nervous system biology and peripheral fat distribution.

References

Fox CS, et al. (2012). Genome-wide association for abdominal subcutaneous and visceral adipose reveals a novel locus for visceral fat in women. PLoS Genetics. PMID: 22589738.

Sung YJ, et al. (2016). Genome-wide association studies suggest sex-specific loci associated with abdominal and visceral fat. International Journal of Obesity. PMID: 26480920.

Chu AY, et al. (2017). Multiethnic genome-wide meta-analysis of ectopic fat depots identifies loci associated with adipocyte development and differentiation. Nature Genetics. PMID: 27918534.

Data sources: GWAS Catalog, Open Targets, ClinVar, ClinGen, NCBI Gene, dbSNP, PheGenI.