MC4R rs17782313: Appetite, Satiety, and What Your DNA Means
MC4R rs17782313 is a common genetic marker near the MC4R gene, which encodes a brain receptor involved in appetite and energy balance. In population studies, the C allele has been associated with slightly higher average body mass index (BMI) and obesity odds. That association is modest: it does not determine how hungry you feel or predict your weight. Research on appetite itself is mixed, so this marker is best understood as one small piece of a much broader picture [R, R].
Explore your MC4R result in free GeneExplorer: Search MC4R rs17782313.
What Does the MC4R Gene Do?
The MC4R gene provides instructions for making the melanocortin-4 receptor, part of a signaling pathway in the brain that helps regulate food intake and energy balance. Signals made from the POMC protein can bind to MC4R and contribute to this process. Appetite is shaped by many connected signals, so MC4R is one part of the system rather than an appetite switch [R, R].
What Is MC4R rs17782313?
The name rs17782313 identifies a specific location in the genome. This marker sits near MC4R, outside the gene’s protein-coding sequence. Large genetic studies found that the C allele is associated with BMI and obesity-related measures across groups. The original researchers suggested the signal could relate to MC4R function, but an association study does not establish that rs17782313 itself changes the receptor or prove exactly how the nearby region acts [R].
This distinction matters because a common marker near a gene is not the same thing as a rare, damaging mutation within that gene. Rare MC4R mutations can cause severe, early-onset obesity; rs17782313 is a common association marker and should not be interpreted as MC4R deficiency [R].
What Do TT, CT, and CC Mean?
In the GenesUnveiled result, C is the allele examined in the association studies. The table below describes the common C/T orientation used for this result:
Genotype | How to read the research association |
TT | Reference group in many studies; may have lower relative risk of obesity. |
CT | One C allele; somewhat higher obesity risk. |
CC | Two C alleles; higher obesity risk. |
These are population-level comparisons, not labels such as “normal” or “high-risk.” If comparing results from different testing services, check the allele orientation shown by each service; genotype letters can be presented differently across data sources.
What Does the Research Say About BMI and Appetite?
The association between rs17782313 and BMI has been observed in large studies. In the original genome-wide study, the BMI association was confirmed in more than 60,000 adults, with a small per-allele effect measured in standardized BMI units [R].
The evidence about appetite is less settled. A 2025 systematic review and meta-analysis included 21 studies with 48,560 participants. Its fixed-effects analysis found a modest association between carrying the C allele and higher appetite, but the result was not statistically significant in the random-effects analysis. The review found no association with measured energy intake [R].
In practical terms, current evidence does not support saying that a CT or CC result means someone will feel hungrier, snack more, or eat more. The appetite finding is suggestive, not conclusive.
What Can This Result Tell You?
MC4R rs17782313 can provide context about one common genetic association studied in relation to BMI. On its own, it cannot tell you:
What your current BMI or body composition is
How hungry you will feel or how much you will eat
Whether you will gain weight
Whether you have an MC4R-related medical condition
How you will respond to a particular diet or exercise plan
Body weight and appetite reflect many biological, personal, and environmental influences. One common SNP cannot capture that complexity or replace a clinical assessment. For another example of a common BMI-associated marker, see our FTO rs9939609 guide.
Frequently Asked Questions
Does the C allele of MC4R rs17782313 cause obesity?
No. The C allele has been associated with a small average difference in BMI and obesity odds in population studies. It does not determine an individual’s weight or cause obesity by itself [R].
Does a TT result mean I have a “normal” BMI?
No. TT means the C allele is not present at this marker in the orientation used by the report. It does not predict BMI, health, or future weight.
Does MC4R rs17782313 tell me if I have a bigger appetite?
Not reliably. A recent meta-analysis found mixed results: one analysis model suggested an association with appetite, another did not, and the review found no association with energy intake [R].
Is rs17782313 a mutation in the MC4R gene?
It is commonly described as an MC4R-related variant because it is near the gene, but it is outside the gene’s protein-coding sequence. It is different from rare MC4R mutations associated with severe early-onset obesity [R].
Explore Your MC4R Result
GenesUnveiled GeneExplorer lets you search available genetic insights, including MC4R rs17782313, after analyzing a raw DNA file. GeneExplorer is free to use with a free account. Read the result as an educational clue about one genetic marker—not as a diagnosis or a prediction of your body weight.
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