5 Reasons You Don’t Have a Flat Belly—That Aren’t Diet and Exercise

You know having a flat stomach isn’t always about just dieting and exercising. There are other factors that prevents you from having that perfect stomach

Although genetics don’t automatically doom you to a large belly, they do play a significant role in fat distribution and storage, according to Michael Nusbaum, MD, a bariatric surgeon, and the founder of Healthy Weight Loss Centers. Visceral fat—the type of fat the body stores in your abdomen and around your intestines and is mostly responsible for keeping people from a flat belly—is partly to blame because of genetics, Dr. Nusbaum explains. “There are people who, no matter what, are going to basically be prone to having the same belly as their mom or dad,” he says.


Genetics again also play a role in food allergies and food sensitivities, according to Dr. Nusbaum. These food issues could also be to blame for excess belly fat and bloat. For example, he says, “If you are African American and your genetics are purely from sub-Saharan Africa, where [your ancestors] didn’t have corn, and you love your sodas and are drinking tons of high-fructose corn syrup, you’re going to store that away as fat because your body can’t metabolize it preferentially.” So not all food allergies result in hives or breakouts; some trigger things like inflammation and abdominal distention, or expansion of the stomach and waist, making the belly less flat. Another common example is gluten sensitivity or celiac disease.


If your gut microbiome is off-balance, you’ll end up with gas, bloating, and a not-so-flat stomach, Dr. Nusbaum says. Pamela Merino, MD, an internist in Miami, Florida, says, however, that more research is necessary into how gut health affects fat storage specifically. Dr. Merino points to research showing that stool transplants from thin people to overweight people result in weight loss—and the only explanation is that thin people’s microbiomes are better at burning fat. Healthline also reports that gut bacteria may have an impact on how the body digests different foods and nutrients. For example, a specific kind of gut bacteria digests fiber, which may lead to weight loss, according to Healthline. Gut bacteria also controls whether or not you feel hungry or full, which can affect your weight.


Antipsychotics and antidepressants are also known to cause significant weight gain, which could result in a less-than-flat belly, Scientific American reports. Dr. Merino agrees that antipsychotics and antidepressants are some of the worst offenders when it comes to medication-related weight gain because they can affect insulin (more on that later). That said, it really depends on the specific type of drug, Dr. Merino says.


Changing hormone levels is one reason people might gain weight during menopause, especially around the abdomen, according to Eldred Taylor, MD, an obstetrician-gynecologist in Atlanta, Georgia. After menopause, fat tissue produces estrogen, and estrogen causes fat storage, creating a vicious cycle, Dr. Taylor says. Different factors can cause hormonal imbalances like this, leading to weight gain. Stress is a common one that Dr. Taylor especially sees in menopausal women. “Stress blocks ovulation, and when women stop ovulating, they don’t make progesterone,” he says. Progesterone is essential because it helps burn fat for energy, Dr. Taylor explains.


Thyroid diseases cause a slower metabolism, predisposing people to accumulate more fat, according to Dr. Merino. “The thyroid is almost like the orchestra director setting the pace for everyone,” she says. “Your thyroid literally sets the pace at which all the organ systems are going to work, so if it is slow, all the other systems are going to go slow, and we tend to gain weight.” Plus, this slowdown causes more fatigue because the body lacks the fuel and direction to go faster, ultimately resulting in less calorie burn, according to Dr. Merino. Myxedema, a rare but life-threatening thyroid problem causing fluid accumulation in the tissues, gives the appearance of excess fat, too, Medical Daily reports.

But don’t be too scared that you will never have a flat belly. Maybe you need to exercise harder

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