Testosterone Deficiency and Lipid Dysregulation in Individuals with Coexisting Hypothyroidism and Type 2 Diabetes: Clinical and Metabolic Implications

Aim and background: This study aims to evaluate the biochemical and endocrine changes in individuals with diabetes, hypothyroidism, and their coexistence, focusing on glycemic control, lipid metabolism, and hormonal balance.Understanding their interplay is crucial for optimizing disease management, enabling early intervention, and improving patient outcomes through personalized therapeutic strategies and risk reduction approaches.Methodology: A total of 200 male subjects were included and categorized into four groups: Controls (n = 50), individuals with diabetes but no hypothyroidism (n = 50), individuals with hypothyroidism but no diabetes (n = 50), and individuals with both conditions (n = 50).Various biochemical parameters, including fasting blood sugar (FBS), postprandial blood sugar (PPBS), HbA1c, lipid profile, thyroid hormones, and testosterone, were analyzed.Statistical analysis was performed using analysis of variance and Tukey's post-hoc test to compare group differences, while Pearson's correlation analysis assessed associations between biochemical markers.Results: The study included 200 male subjects divided into four groups: Controls (n = 50), diabetes without hypothyroidism (n = 50), hypothyroidism without diabetes (n = 50), and both conditions (n = 50).Glycemic parameters-FBS, PPBS, and HbA1c-were significantly elevated in the diabetic and hypothyroid diabetic groups compared with controls and hypothyroid-only individuals (p < 0.05).Lipid profile analysis revealed significantly higher total cholesterol, low-density lipoprotein (LDL) cholesterol, and triglyceride (TG) levels in the diabetic and hypothyroid diabetic groups, with no major differences in high-density lipoprotein cholesterol levels.Thyroid function tests indicated elevated thyroid-stimulating hormone and reduced free triiodothyronine and free thyroxine in hypothyroid and hypothyroid diabetic individuals.Testosterone levels were significantly lower in the diabetic group compared with controls.Pearson's correlation analysis highlighted strong associations between TGs, LDL, total cholesterol, and glycemic markers across different groups.Conclusion: Diabetes and hypothyroidism, when coexisting, exacerbate metabolic and endocrine imbalances, increasing the risk of cardiovascular and endocrine complications.The observed decline in testosterone further emphasizes the systemic impact of these disorders.Clinical significance: Routine thyroid screening in diabetic individuals and comprehensive metabolic assessments in hypothyroid patients are crucial for early detection and management.An integrated therapeutic approach can mitigate long-term complications and improve patient outcomes.