The role of vagal function in cardiovascular risk in older women remains unclear. Autonomic modulation following carbohydrate ingestion (CI), and postural stress (PS) was investigated in 14 healthy men and 21 age-matched post-menopausal women (age: 65.0±2.1 vs 64.1±1.6 years), with normal and comparable insulin sensitivity. Continuous non-invasive finger arterial pressure and ECG were recorded in the lying and the standing positions before and after ingestion of a carbohydrate-rich meal (600kcal, carbohydrate 78%, protein 13%, and fat 8%). Low frequency (LF, 0.04Hz - 0.15Hz) and high- frequency (HF, 0.15Hz - 0.4Hz) components (ms²) of heart rate variability (HRV), low frequency power (mmHg2) of systolic blood pressure variability (SBP LF power),and the sequence method for spontaneous baroreflex sensitivity (BRS, ms/mmHg), were used to quantify autonomic modulation. In response to CI and PS, MAP maintained stable and HR increased in women and men in the lying and standing positions. Following CI (60, 90, and 120 minutes post-prandially) in the standing position, SBP LF power increased by 40% in men (P=0.02), with unchanged HRV parameters; in contrast, in women, HRV HF power halved (P=0.02), with unaltered SBP LF power. During PS before and after CI, similar magnitude of SBP LF power, HRV and BRS changes was observed in men and women. In conclusion, CI induces sex-specific vascular sympathetic activation in healthy older men, and cardiac vagal inhibition in healthy older women; this CI mediated efferent vagal inhibition may suggest differential cardiovascular risk factors in women, irrespective of insulin resistance, and impairment of autonomic control.