Alterations in Abdominal Blood Flows After Drinking Coffee

Area of Science:

• Gastroenterology
• Cardiovascular Physiology
• Nutritional Science

Background:

• Coffee consumption is linked to various health benefits, including reduced risk of type 2 diabetes, cardiovascular disease, and fatty liver.
• Caffeine, a component of coffee, is known to affect blood flow, for instance, by decreasing cerebral artery blood flow and treating apnea in premature infants.
• A potential side effect of caffeine is reduced blood flow in the superior mesenteric artery (SMA), but its impact on abdominal blood flow in adults remains unclear.

Purpose of the Study:

• To investigate the effects of coffee consumption on hemodynamics in the superior mesenteric artery (SMA) and portal vein (PV) in healthy young adults.
• To determine if coffee intake alters abdominal blood flow and if this relates to potential health benefits, such as the suppression of fatty liver disease.

Main Methods:

• A study involving 32 healthy young men (mean age 21 years) was conducted under fasting conditions.
• Participants consumed either coffee or water, and hemodynamic parameters in the SMA and PV were measured using sonography at 30 and 90 minutes post-consumption.
• Blood flow volume and pulsatility index in the SMA and PV were analyzed.

Main Results:

• Drinking coffee led to a significant decrease in SMA blood flow volume (median -13.4%) and an increase in pulsatility index (median 9.0%) 30 minutes after consumption.
• A concurrent decrease in portal vein (PV) blood flow volume (median -11.3%) was observed after drinking coffee.
• These hemodynamic changes persisted for 90 minutes and were more pronounced in individuals who habitually consumed low amounts of caffeine. Water consumption did not produce similar effects.

Conclusions:

• Coffee consumption significantly decreases superior mesenteric artery (SMA) and portal vein (PV) blood flow in healthy young adults.
• The observed reduction in abdominal blood flow following coffee intake may be a contributing factor to the beneficial effects of coffee on liver health, particularly in the context of fatty liver disease.
• The findings highlight the physiological impact of coffee on gastrointestinal hemodynamics, with implications for understanding its broader health effects.