Glucose and insulin do not decrease in a dose-dependent manner after increasing doses of mixed fibers that are...

Area of Science:

• Nutrition Science
• Metabolic Health
• Dietary Fiber Research

Background:

• Conventional dietary advice suggests that increased fiber intake beneficially impacts postprandial glucose and insulin responses.
• The specific effects of varying doses of mixed, viscous fiber on these metabolic markers require further investigation.

Purpose of the Study:

• To investigate whether increasing doses of mixed, viscous fiber, when consumed in a muffin, would lead to a dose-dependent reduction in postprandial glucose and insulin levels in healthy adults.

Main Methods:

• A double-blind, crossover study involving 20 healthy participants (10 men, 10 women).
• Participants consumed muffins containing 0, 4, 8, or 12 g of mixed fibers across four separate visits.
• Blood glucose and insulin levels were measured at regular intervals over a 3-hour period post-consumption.

Main Results:

• Area under the curve (AUC) for glucose was significantly lower with 0 g of fiber compared to 4, 8, or 12 g (P < .006), and showed a trend of increasing with higher fiber doses (P for trend = .0003).
• AUC for insulin was highest with the 4-g fiber dose compared to 0, 8, or 12 g (P < .05) and did not exhibit a dose-dependent pattern.
• No significant correlation was observed between AUC glucose and AUC insulin.

Conclusions:

• Consumption of mixed, viscous fiber in muffins did not result in a dose-dependent decrease in postprandial glucose or insulin levels in healthy adults.
• Individual variability in glucose response significantly influenced the study's outcomes.
• General recommendations regarding the impact of fiber on glucose and insulin metabolism should be made with caution.