Higher plasma concentrations of bisphenol S (BPS)—a common substitute for bisphenol A (BPA)—are positively associated with elevated glycated hemoglobin (HbA1c) levels in adults with type 2 diabetes, according to a study published in the journal Acta Diabetologica. Researchers analyzing data from 307 participants at the University of Pittsburgh Medical Center (UPMC) found that while BPS tracked alongside poorer blood sugar control, traditional dietary surveys failed to effectively estimate personal exposure to these endocrine-disrupting chemicals.
Evaluating Bisphenol Exposure and Glycemic Control in Type 2 Diabetes
The study evaluated 307 participants with physician-confirmed type 2 diabetes lasting at least one year, alongside conditions like hypertension or hyperlipidemia, drawing from baseline samples of the Diabetes Comorbidity Study. Researchers examined whether exposure to bisphenols—industrial chemicals historically found in food packaging and beverage containers—impacts long-term blood sugar regulation. Type 2 diabetes accounts for more than 95% of diabetes cases worldwide, affecting an estimated 830 million adults globally in 2022. Chronic hyperglycemia drives diabetes-related complications, making strict clinical management critical.
According to the findings, participants demonstrated an average baseline HbA1c of 7.43%. Investigators used multivariable linear regression models to account for age, sex, race, medication adherence, and diet. Results showed that higher plasma BPS concentrations remained positively associated with higher HbA1c levels in unadjusted models and after initial adjustments. However, when researchers factored in BMI, physical fitness, and BPA concentrations, the direct statistical significance between BPS and HbA1c diminished.
Medication Adherence and Dietary Assessment Challenges
Clinical guidelines for type 2 diabetes emphasize medication adherence, though non-adherence remains a persistent hurdle in preventing disease progression. In the UPMC cohort, participant medication adherence averaged approximately 80%, tracked closely over roughly one month using electronic Drug Exposure Monitors (eDEM). These monitors recorded correct daily doses, correctly timed doses, and total doses taken. Alongside pharmacological tracking, physical fitness was measured via the six-minute walk test (6MWT), and dietary habits were quantified using the Connor Diet Habit Survey.
The research revealed notable hurdles in tracking chemical intake through questionnaires. The Connor survey did not effectively estimate plasma BPA or BPS levels. No tested dietary category associated with BPS, while beverage and restaurant scores showed links solely to BPA. The survey question covering canned, bottled, and packaged foods demonstrated no correlation with plasma BPS levels. Biochemical plasma assays performed via enzyme-linked immunosorbent assay (ELISA) kits further showed that BPA correlated with circulating triglyceride levels, whereas BPS correlated specifically with HbA1c.
Did you know?
Food packaging represents a major exposure route for endocrine-disrupting chemicals (EDCs). While regulatory and consumer concerns over BPA toxicity drove manufacturers to adopt structural analogs like BPS, human epidemiological data regarding the metabolic profiles of these substitutes remain complex and inconsistent.
Methodological Limits and Future Research Directions
Study authors emphasized caution when interpreting the cross-sectional findings. Because of the observational design, the study cannot establish whether low-level BPS exposure directly causes poorer glycemic control or whether avoiding plastic packaging improves diabetes outcomes. Furthermore, researchers noted that the cholesterol and saturated-fat diet score category contained more questions than other dietary components, potentially elevating the chance of detecting a statistical association.
Better dietary estimation tools are required to accurately capture bisphenol exposure in clinical populations. Future prospective investigations with larger cohorts are necessary to clarify whether chronic, low-level BPS exposure contributes to glycemic dysregulation over time, or if standard lifestyle approaches like targeted dietary behaviors and medication adherence remain the primary drivers of clinical outcomes.
Frequently Asked Questions
What is bisphenol S (BPS)?
BPS is a structural analog and chemical substitute frequently used to replace bisphenol A (BPA) in consumer and industrial products, including various plastics and food containers.
Did the study prove that BPS causes high blood sugar?
No. The research used a cross-sectional design, which shows associations but cannot prove cause-and-effect relationships.
How was medication adherence measured in the study?
Researchers tracked medication adherence for about a month using electronic Drug Exposure Monitors (eDEM) to measure correct daily doses, timing, and total doses taken.
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