Female rats do not develop sucrose-induced insulin resistance

Area of Science:

• Metabolic Physiology
• Nutritional Science
• Endocrinology

Background:

• High-sucrose diets are known to induce insulin resistance and hypertriglyceridemia in male rats.
• Previous research indicates a sex-based difference in metabolic responses to dietary interventions.

Purpose of the Study:

• To investigate whether female rats exhibit similar susceptibility to sucrose-induced insulin resistance and hypertriglyceridemia as observed in males.
• To analyze the impact of long-term high-sucrose feeding on glucose kinetics and lipid metabolism in female Wistar rats.

Main Methods:

• Female Wistar rats were fed either a high-sucrose (68% energy) or high-starch (68% energy) diet for 3, 5, or 8 weeks.
• Glucose kinetics were assessed using [3-(3H)]glucose under basal and hyperinsulinemic conditions (clamp study).
• Plasma and tissue triglyceride levels, as well as tissue glycogen content, were measured.

Main Results:

• No significant differences in body weight or basal glucose kinetics were observed between the sucrose-fed (SU) and starch-fed (ST) groups at any time point.
• Hyperinsulinemic glucose infusion rates and clamp rates of glucose appearance did not differ between diet groups.
• Plasma and tissue triglyceride levels and tissue glycogen content remained comparable between SU and ST groups.

Conclusions:

• Female rats do not develop sucrose-induced insulin resistance or hypertriglyceridemia under the conditions studied.
• Dietary sucrose does not appear to negatively impact glucose metabolism or lipid profiles in female rats, contrasting with findings in males.