Selective effects of nutrients on gut sensitivity and reflexes

Area of Science:

• Gastroenterology
• Neurogastroenterology
• Nutritional Science

Background:

• Intestinal nutrients trigger gut reflexes and influence sensory perception.
• Understanding nutrient-specific effects on gut motor and sensory functions is crucial.

Purpose of the Study:

• To compare the potency of motor and sensory effects of different nutrients in the intestine.
• To investigate the relationship between nutrient-induced motor and sensory responses.

Main Methods:

• Healthy participants underwent paired duodenal infusions of isocaloric carbohydrates and lipids.
• Gastric compliance and perception of distension were measured using a tensostat at varying nutrient loads (0.2, 0.5, 1 kcal/min).

Main Results:

• At low caloric loads, lipids and carbohydrates had similar effects on gastric perception and compliance.
• At medium and high caloric loads, lipids induced greater gastric relaxation and altered tolerance compared to carbohydrates.
• High-lipid loads significantly reduced gastric tolerance and increased compliance, while carbohydrates showed minimal effects.

Conclusions:

• Intestinal nutrient effects on gastric tone are more potent than on gastric sensation.
• Both motor and sensory responses to nutrients are dependent on caloric load and nutrient type (lipids vs. carbohydrates).