A small crossover study shows that interrupting long periods of sitting with a 2-minute brisk walk can improve postprandial blood sugar control, while buttock fat appears to play a stabilizing role after a carbohydrate-rich meal.
Study: Sex- and fat depot-specific glucose metabolism after prolonged (uninterrupted) sedentary consumption of a carbohydrate-rich meal. Image credit: Alexander_Evgenyevich / Shutterstock
In a recent study published in the journal nutrition and diabetesA group of researchers investigated how prolonged versus interrupted sitting affects the interstitial glucose response of fat stores in the abdomen and buttocks, taking into account gender differences.
How you sit, fat distribution, blood sugar control
What happens in your body when you sit for hours after consuming a lot of carbohydrates?Eating too many carbohydrates and not getting enough exercise can increase your risk of developing type 2 diabetes.
Adipose tissue helps regulate glucose, but where fat is stored (abdomen or hips) and biological sex can influence how the body processes glucose. Belly fat is associated with metabolic disease, while buttock fat may have protective effects. However, real-time glucose behavior within these fat stores remains poorly understood.
Interrupted Locus Study Design and Methods
The study involved 20 healthy adults with an average age of approximately 29 years and a normal BMI, including an equal number of men and women. Participants completed a randomized crossover design in two conditions: prolonged sitting (SIT) and interrupted sitting (ACTIVE). Each trial lasted 5.5 hours and included ingestion of a carbohydrate-rich meal containing approximately 77% carbohydrates.
To collect local glucose responses, continuous glucose monitoring (CGM) devices were used in both abdominal subcutaneous adipose tissue (ASAT) and gluteal subcutaneous adipose tissue (GSAT) and were inserted 24 hours before the first test. The researchers measured body composition using dual-energy X-ray absorptiometry (DXA) and bioelectrical impedance analysis (BIA).
To assess insulin sensitivity and resistance, participants also completed an oral glucose tolerance test (OGTT) using 75 grams of glucose, and indicators such as Homeostasis Model Assessment of Insulin Resistance (HOMA-IR) and Mazda Index were used to assess insulin resistance and insulin sensitivity. In the ACTIVE condition, participants were required to perform a 2-min brisk walking exercise every 20 min.
The researchers also conducted laboratory experiments using human preadipocyte cell lines derived from abdominal and buttock fat to investigate the molecular mechanisms underlying glucose uptake and lipid metabolism. Statistical analyzes included analysis of variance (ANOVA), correlation tests, and nonparametric comparisons.
Gender-specific glucose responses in fat stores
The results showed that interstitial glucose responses differed by body fat location, physical activity level, and gender. Specifically, in women, interstitial glucose rose more slowly and remained more stable within gluteal fat stores during prolonged sitting compared to abdominal fat. Therefore, buttock fat may provide a buffer against postprandial (postprandial) blood glucose fluctuations.
When participants briefly stopped walking, blood sugar levels decreased in both abdominal and buttock fat stores. However, reductions were greater in women, with reductions in breakfast preprandial interstitial glucose, postprandial (postprandial) glucose, and area under the glycemic curve (AUC) observed during the study and during selected postprandial periods.
In practical terms, this means that even short brisk walking breaks, such as walking for a few minutes every 20 minutes, can significantly improve the way your body processes sugar after meals.
For men, the benefits of sedentary interruption were more modest, but still present. Interestingly, men with higher liver-related insulin resistance or higher abdominal fat showed greater improvement, suggesting that within this healthy study group, those with less favorable metabolic profiles may benefit most from exercise breaks.
When comparing fat depots, during sedentary conditions, buttock fat consistently showed more stable glucose behavior than abdominal fat. However, this difference became less pronounced when physical activity was introduced, indicating that exercise can reduce depot-specific differences in interstitial glucose responses across adipose regions.
Fat metabolism in the buttocks and its effects on health
Laboratory studies have provided insight into metabolic differences between tissues. Gluteal adipocytes had higher expression of glucose transporter 1 (GLUT1) than abdominal adipocytes, allowing sustained glucose uptake without insulin.
Additionally, postfeeding signals related to de novo adipogenesis (DNL) were increased in gluteal adipocytes. The DNL pathway in buttock adipocytes is driven by carbohydrate-responsive element-binding proteins.
Rather than proving that gluteal adipocytes convert glucose to storage fat at a higher rate than abdominal adipose tissue, these findings suggest that after feeding, gluteal adipocytes may be better equipped to take up glucose and activate lipogenic pathways.
The mechanism of DNL was most evident between 3 and 6 hours postprandial, consistent with the stabilization of blood glucose levels in vivo.
In contrast, abdominal adipocytes express higher levels of insulin-dependent glucose transporter 4 (GLUT4), suggesting greater dependence on insulin-mediated glucose uptake rather than directly indicating an increased risk of hyperglycemia.
This study demonstrated that glucose metabolism is influenced by both behavioral factors (sedentary vs. active) and biological factors related to fat distribution.
Further research is needed to better understand and define how lifestyle behaviors interact with fat distribution to influence metabolic health.
The authors noted important limitations. The study was small, short-term, and conducted in healthy adults without diabetes or obesity, so the findings may not directly apply to people with metabolic diseases. They also noted that interstitial glucose patterns measured with CGM may reflect differences in glucose delivery, tissue uptake, local blood flow, or a combination of these mechanisms.
Female participants also completed the main study during the follicular phase. Therefore, it remains unclear whether the adipose tissue glucose response is similar at other stages of the menstrual cycle.
Walking breaks and blood sugar control after meals
Healthy adults who participate in brief periods of physical activity throughout the day have improved postprandial glucose responses. In this study, this is especially true for women and men with higher hepatic insulin resistance or android fat.
Gluteal fat appears to play a stabilizing role by supporting stable glucose uptake and lipid synthesis pathways. Regular activity can counteract the negative effects of a sedentary lifestyle on metabolic health.
Incorporating short brisk walking breaks after meals may support healthier postprandial blood sugar regulation, but long-term studies are needed to determine whether this reduces the risk of diabetes and other metabolic diseases, thereby making it part of a daily health routine.
Reference magazines:
- Chen, Y.-C., Lin, Y.-T., Wang, L.-C., Lee, C.-H., Su, S.-C., Lu, C.-H., Li, P.-F., Huang, C.-L., Ho, L.-J., Lin, M.-H., Liu, H.-Y., Kuo, F.-C. (2026). Sex- and fat depot-specific glucose metabolism after ingestion of a carbohydrate-rich meal in a (uninterrupted) sedentary state. Nutrition and diabetes. Doi: 10.1038/s41387-026-00422-0, https://www.nature.com/articles/s41387-026-00422-0
