What you carry at this position in your DNA and what research says about it.
Heart and Metabolic Health: 10/10 evidence, 26 publications.
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Sample genotype (not yours): G/G
Typical Metabolic Profile
This genotype is associated with a standard metabolic rate, typical blood sugar regulation, and average cardiovascular risk.
What this genotype means: Typical blood sugar regulation; Slightly higher susceptibility to weight gain.
Sample genotype (not yours): C/C
This genotype is linked to a naturally lower body weight but carries a slightly higher risk of type 2 diabetes.
What this genotype means: Naturally lower body mass index; Slightly increased risk of type 2 diabetes.
Sample genotype (not yours): G/C
Lower Heart Disease Risk
Having one copy of the variant allele is linked to a notable reduction in cardiovascular risk and balanced metabolic traits.
What this genotype means: Reduced risk of cardiovascular disease; Balanced body weight and blood sugar profile.
Gene function and biological role
Gene Function: The GIPR gene encodes the receptor for gastric inhibitory polypeptide, an incretin hormone released from the gut after eating. This receptor plays a critical role in stimulating insulin secretion from pancreatic beta cells in response to glucose [1]. Beyond its role in blood sugar regulation, GIPR signaling is heavily involved in lipid metabolism and fat deposition in adipose tissue [2]. It also influences bone remodeling, helping to preserve bone density after nutrient intake [3]. Modern therapeutic agents, such as dual GIP/GLP-1 receptor agonists, target this pathway to manage weight and blood sugar [4].
Variant Impact: The rs1800437 variant is a missense mutation in the GIPR gene that replaces the amino acid glutamate with glutamine at position 354. This structural change results in a partial loss of function, reducing the receptor's signaling capacity in response to GIP [5]. Because of this reduced signaling, carriers of the variant C allele tend to have lower body mass index and reduced fat accumulation [4]. However, the same reduction in receptor activity can impair postprandial insulin release, leading to higher blood sugar levels after eating [6]. This variant represents a classic genetic trade-off between lower body weight and altered glucose metabolism.
Key Insight: This variant represents a direct biological trade-off where the allele that protects against obesity simultaneously increases the risk of type 2 diabetes.
Location: GIPR. Chromosome 19 · 19q13.32 · 45.7 Mb
Estimated prevalence by population
Global 68.4%; European 63.0%; African 78.3%; East Asian 64.2%; South Asian 72.1%; Americas 75.3%; Ashkenazi 49.8%; Finnish 59.7%; Middle Eastern 70.6%; Amish 78.1%.
Estimated GG genotype frequency.
Global 28.3%; European 32.7%; African 20.4%; East Asian 31.8%; South Asian 25.6%; Americas 22.9%; Ashkenazi 41.6%; Finnish 35.1%; Middle Eastern 26.9%; Amish 20.6%.
Estimated GC genotype frequency.
Global 3.3%; European 4.2%; African 1.3%; East Asian 3.9%; South Asian 2.3%; Americas 1.7%; Ashkenazi 8.7%; Finnish 5.2%; Middle Eastern 2.6%; Amish 1.4%.
Estimated CC genotype frequency.
Showing effects for G/G genotype
Cardiovascular & Metabolic
Obesity & Body Composition
Body Mass Index. Evidence: 10/10. Source: PMID 29273807. Higher BMI.
Diabetes & Glycemic Traits
Type 2 Diabetes. Evidence: 7/10. Source: PMID 29632382. Lower Risk.
Heart Disease
Cardiovascular Health. Evidence: 3/10. Source: PMID 17624916. Typical Risk.
Organ Systems
Bone, Joint & Connective Tissue Health
Bone Mineral Density. Evidence: 3/10. Source: PMID 24446656. Typical Density.
Showing effects for C/C genotype
Body Mass Index. Evidence: 10/10. Source: PMID 29273807. Lower BMI.
Type 2 Diabetes. Evidence: 7/10. Source: PMID 29632382. Higher Risk.
Bone Mineral Density. Evidence: 3/10. Source: PMID 24446656. Lower Density.
Showing effects for G/C genotype
Body Mass Index. Evidence: 10/10. Source: PMID 29273807. Typical BMI.
Type 2 Diabetes. Evidence: 7/10. Source: PMID 29632382. Typical Risk.
Cardiovascular Health. Evidence: 3/10. Source: PMID 17624916. Lower Risk.
What this genotype means for the people who carry it
Sample genotype: GG (Homozygous)
Carrying two copies of the common G allele means the GIP receptor functions at full capacity. This optimal receptor activity supports efficient insulin release after meals, which helps maintain stable blood sugar levels and lowers the risk of type 2 diabetes [1]. However, fully active GIP signaling also promotes efficient fat storage, which is linked to a slightly higher body mass index and increased susceptibility to obesity [2]. Bone health is typically well-supported, as normal GIP signaling helps preserve bone mineral density following nutrient intake [3]. Overall, this genotype represents the baseline metabolic profile found in the majority of the population.
Typical blood sugar regulation; Slightly higher susceptibility to weight gain.
Sample genotype: CC (Homozygous)
Carrying two copies of the C allele results in a partial loss of GIP receptor function. This reduction in signaling limits the body's ability to store fat efficiently, which naturally protects against weight gain and leads to a lower average body mass index [1]. However, the compromised receptor function also impairs postprandial insulin secretion, which can elevate blood sugar levels and increase the risk of developing type 2 diabetes [2]. Additionally, some studies suggest that reduced GIP signaling may lead to lower bone mineral density and a higher risk of fractures in postmenopausal women, though larger analyses indicate this effect is modest [3].
Naturally lower body mass index; Slightly increased risk of type 2 diabetes.
Sample genotype: GC (Heterozygous)
Heterozygous individuals carry one functional G allele and one partial loss-of-function C allele. This combination appears to offer a unique cardiovascular advantage, with clinical data showing a significant 28 percent reduction in the risk of heart disease [1]. The balance between the two alleles also results in intermediate metabolic traits, preventing the higher obesity risk associated with the G/G genotype while avoiding the elevated diabetes risk of the C/C genotype [2]. Bone mineral density and fracture risk remain comparable to the general population baseline [3]. This genotype represents a highly favorable metabolic and cardiovascular profile.
Reduced risk of cardiovascular disease; Balanced body weight and blood sugar profile.
Variants with shared genetic architecture
rs10423928 · GIPR Gene · Chr 19 · Weight and Blood Sugar
rs11672660 · GIPR Gene · Chr 19 · Weight and BMI
rs663129 · MC4R Gene · Chr 18 · Weight and Heart Health
Genetic determinants of circulating GIP and GLP-1 concentrations.
Genetic variation in GIPR influences the glucose and insulin responses to an oral glucose challenge.
Association analyses of GIP and GIPR polymorphisms with traits of the metabolic syndrome.
Content updated August 2026.
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