HSA | FSA CARDS ARE NOW ACCEPTED

Last reviewed: May 12, 2026 Last updated: May 12, 2026

Written by: Jay Hastings , CEO of PlexusDx

Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations. He has more than 20 years of experience across healthcare innovation, genomics, laboratory operations, healthcare investing, and strategic finance. His work has included scaling healthcare startups, leading CLIA lab integrations, and helping expand consumer access to precision health tools.

Medically reviewed by: Jayden Lee, PharmD, EMBA

Jayden Lee, PharmD, EMBA, is the PlexusDx Medical Science Liaison with a PharmD and MBA specializing in pharmacogenomics and clinical product development, with a proven ability to bridge the gap between genomic research and practical patient outcomes. Dr. Lee has more than 10 years of professional experience in clinical pharmacy, academia, and research.

How STAT3 and Saturated Fat Interact: What Your Genetics May Mean for Weight and Health

Saturated fats are found in fatty cuts of meat, butter, cheese, coconut oil, and some processed foods. Eating too much saturated fat can raise low-density lipoprotein cholesterol, often called LDL or "bad" cholesterol, which is linked to higher risk of heart disease. The STAT3 gene helps regulate appetite, energy balance, and hormone signaling that influence how your body stores fat. A common variant in STAT3 (rs744166) can change how strongly your body responds to dietary saturated fat, which can affect weight, especially abdominal fat.

Why abdominal fat matters

Fat stored around the abdomen is more metabolically active and linked to higher risk of insulin resistance, type 2 diabetes, and cardiovascular disease than fat stored elsewhere. Genetic tendencies that increase abdominal fat in response to dietary patterns deserve focused attention because changes in diet and lifestyle can reduce that risk.

Genetic Interpretations

2 effect alleles (GG)

You carry two copies of the G allele at rs744166 (GG). Research indicates that men with this genotype may be more likely to gain weight and accumulate abdominal fat when regularly consuming a diet high in saturated fat. Variations in STAT3 can influence hormone signaling that controls appetite and energy balance, which may amplify the effect of saturated fats on body composition.

  • Diet: Limit saturated fat sources such as fatty meats, butter, full-fat dairy, processed baked goods, and tropical oils like coconut oil. Replace these with mono- and polyunsaturated fat sources: olive oil, avocado, nuts, seeds, and fatty fish (salmon, mackerel, sardines).
  • Protein and fiber: Emphasize lean proteins (poultry, legumes, tofu) and high-fiber foods (whole grains, vegetables, fruits, legumes) to support satiety and reduce overeating.
  • Exercise: Combine aerobic activity (30–60 minutes most days) and strength training (2–3 times per week) to reduce abdominal fat and improve metabolic health.
  • Blood tests to consider: fasting lipid panel, fasting glucose or HbA1c, and inflammatory markers if recommended by your provider.
  • Supplements to discuss with your clinician: omega-3 fatty acids (to support lipid profile and inflammation), fiber supplements if dietary fiber is low, and vitamin D if deficient.
  • Lifestyle: Prioritize sleep (7–9 hours), stress management (mindfulness, breathing exercises), and limit processed foods and sugar-sweetened beverages.
1 effect allele (AG)

You carry one copy of the G allele at rs744166 (AG). This genotype is associated with a moderate influence of saturated fats on weight, particularly abdominal fat. The single G allele may produce an intermediate effect on the signaling pathways that regulate appetite, energy balance, and response to leptin.

  • Diet: Reduce saturated fat intake and choose healthier fats such as olive oil, avocados, nuts, seeds, and fatty fish. Focus on whole-food meals built around vegetables, legumes, whole grains, and lean proteins.
  • Portion control: Pay attention to meal composition and portion sizes, especially for higher-calorie foods. Using visual cues and plate methods can help balance macronutrients.
  • Exercise: Regular aerobic exercise plus resistance training supports fat loss and muscle maintenance. Aim for consistent activity rather than sporadic intense workouts.
  • Blood tests to consider: fasting lipid panel and glucose measures to monitor cardiometabolic risk if diet or weight change is a concern.
  • Supplements to discuss with your clinician: omega-3s for cardiovascular support and a daily multivitamin if diet is restricted; consider a fiber supplement if needed.
  • Lifestyle: Manage stress and sleep quality; both influence appetite hormones and weight regulation.
0 effect alleles (AA)

You carry two copies of the A allele at rs744166 (AA). This genotype is associated with a typical response to saturated fat intake. Unlike individuals with the G variant, you do not appear to have an increased genetic susceptibility to weight gain specifically in response to saturated fats. However, high saturated fat intake can still raise LDL cholesterol and influence heart disease risk for everyone.

  • Diet: Although your genetic risk for saturated-fat-driven weight gain may be lower, choose healthier fat sources (olive oil, nuts, fatty fish) and limit excess saturated fat to support heart health.
  • General recommendations: Follow a balanced eating pattern rich in whole foods, plenty of vegetables, lean proteins, whole grains, and adequate fiber.
  • Exercise: Maintain regular physical activity combining cardio and strength training to preserve lean mass and metabolic health.
  • Blood tests to consider: routine fasting lipid panel and glucose screening as part of preventive care.
  • Supplements to discuss with your clinician: omega-3s if dietary fish intake is low; vitamin D and other supplements only as clinically indicated.
  • Lifestyle: Continue good sleep habits, stress reduction, and moderation of alcohol and tobacco use.

Practical Food Swaps

  • Swap butter for extra virgin olive oil or avocado oil when cooking.
  • Choose lean cuts of meat and remove visible fat; try grilling or baking instead of frying.
  • Replace full-fat dairy with low-fat or fermented options like yogurt, where appropriate for your tolerance and nutritional needs.
  • Snack on nuts, seeds, or fruit instead of processed chips and pastries.
  • Include fatty fish in your meals at least twice per week or discuss an omega-3 supplement with your clinician.

Monitoring and When to Talk to a Healthcare Provider

Genetics is one part of the picture. Diet, activity level, sleep, stress, medications, and medical conditions also influence weight and heart health. If you are concerned about weight gain, abdominal fat, cholesterol levels, or have a family history of heart disease or diabetes, consult your healthcare provider. They can help interpret these genetic results in the context of your full medical history, order appropriate blood tests, and design a personalized plan.

Notes on Supplements and Blood Tests

  • Omega-3 fatty acids can help support healthy triglyceride levels and may have anti-inflammatory effects; dose and necessity should be individualized.
  • A fasting lipid panel evaluates total cholesterol, LDL, HDL, and triglycerides to guide dietary and medical decisions.
  • HbA1c or fasting glucose helps assess blood sugar control and diabetes risk, which is relevant when abdominal fat increases.

Important Disclaimer

PlexusDx provides educational information about genetic predispositions only. This content is not medical advice. Always consult your healthcare provider before starting or stopping any diet, exercise program, supplement, or medical treatment. Use this information as one part of a broader discussion with a qualified clinician who knows your medical history and current health status.

If this genetic variant is present in your PlexusDx results, the following tests and reports are commonly used to explore it further:

🧬 Genetic Tests:

🧪 Blood Tests:

📄 Genetic Report:

Frequently Asked Questions About Saturated Fats and STAT3 rs744166

What is the STAT3 rs744166 variant and how does it affect my response to saturated fat?

The STAT3 gene helps regulate appetite, energy balance, and hormone signaling that influence how the body stores fat. The rs744166 variant can change how strongly your body responds to dietary saturated fat, which may affect weight and especially abdominal fat.

How does the rs744166 genotype relate to abdominal fat and cardiometabolic risk?

Abdominal fat is more metabolically active and is linked to higher risk of insulin resistance, type 2 diabetes, and cardiovascular disease. If your STAT3 rs744166 genotype increases susceptibility to abdominal fat gain when eating high saturated fat diets, focusing on diet and lifestyle changes may help lower that risk.

What diet, exercise, and lab tests are recommended based on STAT3 rs744166 results?

Across genotypes, reducing saturated fat (e.g., fatty meats, butter, full-fat dairy, processed baked goods, and tropical oils like coconut oil) and choosing unsaturated fats (olive oil, avocado, nuts, seeds, fatty fish) supports heart health. Regular aerobic activity plus strength training helps reduce abdominal fat. Labs often considered include a fasting lipid panel, fasting glucose or HbA1c, and—if recommended—inflammatory markers, and you may discuss supplements like omega-3s or fiber with your clinician.

What tests can help me learn more about Saturated Fats and STAT3 rs744166?

The Optimal Diet and Weight Loss Genetic Test delivers over 295 genetic insights related to nutrition response, body composition, metabolism, and fitness. The Weight and Body Fat Genetic Report translates your results into personalized, actionable guidance. Your healthcare provider can also recommend targeted blood tests based on your specific pathway results and health history to complement your genetic insights with current biomarker data.

Medical and Editorial Standards

Medical review process: This article was reviewed for medical accuracy, scientific clarity, evidence alignment, and appropriate discussion of genetics, medications, supplements, biomarkers, and health-related claims.

Sources and evidence: PlexusDx educational content is developed using peer-reviewed research, clinical literature, reputable medical references, and, where applicable, public health or regulatory guidance. References are included at the end of the article when scientific, medical, or health-related claims are discussed.

Commercial transparency: PlexusDx offers genetic testing, blood biomarker testing, personalized supplement recommendations, and related precision wellness services. Product mentions are intended to help readers understand available options and should not be interpreted as medical advice.

Important disclaimer: PlexusDx educational content is for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about medications, supplements, genetic testing, lab testing, or health-related care.