Genetic Muscle Formation & Skinny Fat

Muscle formation is genetic (1), and muscle tissue makes up roughly 40% (2, 3) of the human body. It powers every move we make, including a child’s first steps, our daily activities, athleticism, and recovery after an injury. While directly affecting metabolism (4), diet (5) — including insulin resistance (6) — exercise (7), and lifestyle (8). Thus, how much muscle tissue you have, or do not have (skinny fat)(9), matters.

Have you ever wondered how much muscle tissue you have? Ever asked your doctor for an accurate measurement of your default genetic muscle? Or how much muscle you’ve gained from exercise? Or lost due to aging (sarcopenia) or poor dietary or lifestyle (sleep, stress, etc.) choices? If you have, you know that the best your doctor can do at this time is offer the non-specific and inaccurate lean body mass (LBM)(10) and BMI (11, 9) estimates. Neither is capable of measuring muscle in any capacity, let alone accurately. Both are designed to estimate BODY FAT.

Genetic Muscle Formation & Skinny Fat

If your genetic muscle formation is underdeveloped (skinny fat)(9), to whatever degree, how would you know? To know that, you would have to have a baseline average muscle measurement to compare your personal muscle measurement to. What is the average amount of muscle tissue the average human being is born with? Currently, science and medicine don’t know, because no such measurement exists. And even if it did, at present, there is no approved way to accurately measure total genetic muscle — or muscle, in general — at any point in your life.

How is that possible in July 2026, with the advancement of technology? It is possible because mainstream institutions, science, and medicine are very slow at evolving and adapting. They arrogantly, stubbornly, and unscientifically hold to inaccurate approved standards and tools like BMI, LBM, DEXA (12), and InBody (12), refusing to recognize and admit to known limitations, no matter how severe and detrimental they are. All the while rejecting new scientific research that can truly improve things.

Imagine a day when you can visit your doctor, and they can run an MRI scan to accurately determine your total genetic muscle tissue — your muscle tissue, in general — and compare it to a baseline muscle average to help you better understand how it affects your body composition & shape, metabolism, diet, exercise, lifestyle, and overall health. Better yet, envision being able to download an app that can do all that for you in the privacy of your own home. Our MRI Study (13) is the solution.

Scientific Health Quizzes – Genetic Muscle Formation

In the meantime, we have developed the Scientific Health Quizzes as dual-purpose tools. The Quizzes will be used to accurately screen research participants for our pending MRI Study. In terms of individual use, the Science Body Type Quiz accurately estimates body composition, especially skinny fat — and its accuracy will be further improved with the successful completion of our MRI Study. The Scientific Metabolism Quiz accurately calculates each person’s unique metabolism (slow, average, fat) and metabolic rate (decreased, steady, increased).

Moreover, the Diet, Exercise, and Lifestyle Quizzes help paint a complete picture of individual health. Accounts are free, private, and secure, allowing you to track your progress and changes over time. Free options are available.

References

1. Skinny Fat Science: Is Muscle/Mass Genetic and How Does It Affect Skinny Fat?, November 20, 2024. https://skinnyfat.fellowone.com/skinny-fat-science/is-muscle-mass-genetic-and-how-does-it-affect-skinny-fat/
2. UGA Today: Scientists ID genetic basis for muscle formation, February 5, 2026, David Mitchell. https://news.uga.edu/scientists-id-genetic-basis-for-muscle-formation/
3. ScienceDirect, Biochemistry, Genetics and Molecular Biology: Skeletal Muscle, 2010, The International Journal of Biochemistry & Cell Biology. https://www.sciencedirect.com/topics/biochemistry-genetics-and-molecular-biology/skeletal-muscle
4. Skinny Fat Science: How Skinny Fat Affects Metabolism, August 7, 2024. https://skinnyfat.fellowone.com/skinny-fat-science/how-skinny-fat-affects-metabolism/
5. Skinny Fat Science: The Best Skinny Fat Diet, According to Science, July 29, 2024. https://skinnyfat.fellowone.com/skinny-fat-science/the-best-skinny-fat-diet-according-to-science/
6. Skinny Fat Science: Skinny Fat & Insulin Resistance, June 4, 2025. https://skinnyfat.fellowone.com/skinny-fat-science/skinny-fat-insulin-resistance/
7. Skinny Fat Science: The Best Skinny Fat Exercise, According to Science, August 2, 2024. https://skinnyfat.fellowone.com/skinny-fat-science/the-best-skinny-fat-exercise-according-to-science/
8. Skinny Fat Science: The Best Skinny Fat Lifestyle, According to Science, August 14, 2024. https://skinnyfat.fellowone.com/skinny-fat-science/the-best-skinny-fat-lifestyle-according-to-science/
9. Skinny Fat Science: What is Skinny Fat?, July 26, 2024. https://skinnyfat.fellowone.com/skinny-fat-science/what-is-skinny-fat/
10. Skinny Fat Science: Lean Body Mass (LBM) and Skinny Fat, June 3, 2026. https://skinnyfat.fellowone.com/skinny-fat-science/lean-body-mass-lbm-and-skinny-fat/
11. Skinny Fat Science: Skinny Fat is a Lack of Genetic Muscle – Beyond Normal-Weight Obesity, August 13, 2025. https://skinnyfat.fellowone.com/skinny-fat-science/skinny-fat-is-a-lack-of-genetic-muscle-beyond-normal-weight-obesity/
12. Skinny Fact Science: Low Muscle Mass, Skinny Fat, and How to Measure, December 10, 2025. https://skinnyfat.fellowone.com/skinny-fat-science/low-muscle-mass-skinny-fat-and-how-to-measure/
13. Skinny Fact Science: Scientific Skinny Fat MRI Study – Proving What Skinny Fat Is, March 26, 2025. https://skinnyfat.fellowone.com/skinny-fat-science/scientific-skinny-fat-mri-study-proving-what-skinny-fat-is/