For years, we’ve blamed lifestyle choices for the dreaded “dad bod” – that gradual accumulation of belly fat that seems inevitable as men age. But groundbreaking research from Stanford’s genetics laboratory suggests there’s more to the story than just too many beers and too little exercise.
Dr. Michael Snyder, Professor of Genetics at Stanford University School of Medicine, has spent over a decade studying why different people respond so differently to the same foods, exercises, and health interventions. He talked about his findings in a recent video, revealing that your body’s tendency to store fat, spike blood sugar, and respond to various foods isn’t just about willpower – it’s written in your genes.
Through extensive research tracking hundreds of participants, Dr. Snyder’s laboratory discovered that people fall into distinct metabolic categories, or what they call “agotypes.” These are different aging patterns that affect how our bodies process food and store fat. Some people are naturally “metabolic agers,” meaning their bodies are genetically predisposed to process carbohydrates and fats differently than others.
“We found that genetics accounts for about 20% of your glucose levels,” explains Dr. Snyder. “Your microbiome accounts for another 20-30%, and the rest comes down to lifestyle.” This means that even before you take your first bite of food or step on a treadmill, your genetic makeup has already set the stage for how your body will respond.
The research reveals why some men seem to effortlessly maintain their physique while others struggle despite similar efforts. Dr. Snyder’s team identified that people have different genetic predispositions for insulin sensitivity, fat storage patterns, and metabolic responses to exercise.
For instance, if you’re genetically predisposed to muscle insulin resistance, your body may struggle to effectively use glucose, leading to fat storage particularly around the midsection. Conversely, some people have beta cell defects, meaning they make insulin fine but can’t release it properly from the pancreas.
“We can now subtype people according to their glucose regulation patterns,” says Dr. Snyder. “This affects how you react to foods and determines what lifestyle modifications will actually work for your specific genetic makeup.”
The most exciting development is a simple blood test that can identify your specific metabolic subtype. Using advanced metabolomics technology, researchers can analyze 650 different metabolites from just a few drops of blood to determine your unique “agotype.”
This test, now commercially available through companies like Iolo, doesn’t just tell you whether you’re at risk for developing metabolic issues – it provides actionable recommendations based on your specific genetic profile.
While genetics play a significant role, Dr. Snyder emphasizes that they’re not destiny. “For the average person, genetics only accounts for about 16% of lifespan,” he notes. “Your lifestyle is by far your biggest factor.” The key is understanding your genetic predispositions so you can work with your body rather than against it.
