Increasing fibre in white flour and bread: Implications for health and processing

Area of Science:

• Agricultural Science
• Human Nutrition
• Food Science

Background:

• Dietary fibre intake is below recommended levels globally, despite its health benefits.
• Cereals, particularly bread, are significant sources of dietary fibre in Western diets.
• White bread, despite lower fibre content, remains culturally dominant over wholegrain options.

Purpose of the Study:

• To investigate the potential of increasing dietary fibre in white bread to improve public health.
• To assess the impact of enhanced fibre content on starch digestion and glucose release.
• To explore genetic variations in wheat for fibre enrichment without affecting product quality.

Main Methods:

• Modelling UK food consumption data to predict fibre intake changes.
• Utilizing in vitro studies to assess the physiological effects of increased fibre.
• Analyzing genetic variation in wheat for targeted fibre enhancement.

Main Results:

• A 50% increase in white flour fibre content could raise daily intake by 1.04g (females) and 1.41g (males).
• A 20% increase in wholegrain fibre content also significantly boosts intake.
• In vitro data suggests enhanced fibre in white bread slows starch digestion and glucose release.

Conclusions:

• Increasing the fibre content of white bread is a viable strategy to increase population-level fibre intake.
• Genetic modification of wheat offers a pathway to fibre-enriched staple foods.
• Higher fibre white bread may contribute to better glycemic control.