WP 2-4 The Freising Fiber Intervention Studies

Acceptance of fiber-enriched foods: The Freising Fiber Intervention Studies

A high fiber and whole-grain intake is regularly recommended to the population for the prevention of metabolic and cardiovascular as well as other diet-related diseases. The current median intake of fiber in the German population in the age group 51 to 65 years is 18 g in females and 20 in men (1/3 soluble and 2/3 insoluble fiber), markedly below the recommended intake level of > 30 g/day. In accordance with national guidelines, an increase in fiber intake in the general population is strongly promoted. Despite this clear message and a broadening portfolio of fiber-enriched foods in supermarkets, consumer acceptance of such foods is surprisingly low for unknown reasons and the sensoric perception of fiber-enriched foods by consumers remains elusive.

Prospective cohort studies suggest a protective role of a high whole-grain/fiber intake on the development of metabolic, cardiovascular and malignant diseases. This project aims to investigate the acceptance and consumption of fiber-enriched foods in a middle-aged population with or without metabolic syndrome (n=120). Initially, a variety of fiber-enriched foods is evaluated using a defined battery of questionnaires on sensory qualities and consumer acceptance. Then, fiber-enriched products are provided for 12 weeks under real-life conditions and dietary habits and consumption of fiber-enriched foods are documented. In addition, established cardiovascular risk factors are measured. In a proof-of-concept pilot study, the effect of a defined fiber product on the metabolome and microbiome will be examined under strictly controlled conditions. This study will serve as a reference for subsequent studies to examine the acceptance and efficacy of newly developed tastier fiber-enriched products (e.g. from WP2-3) and may offer new business opportunities for successful development and promotion of healthy and tasty fiber-rich convenience foods.

Objective:

Primary aim of this project is to investigate consumer acceptance of various fiber-enriched foods already available on the market. Primary endpoint is the increase in fiber intake. Other objectives include

  1. Sensoric evaluation of fiber-enriched foods
  2. Preference and consumption of fiber-enriched foods under free-living conditions
  3. Effects of current fiber-enriched products on the cardiovascular risk profile under free-living conditions

In an additional proof-of-concept study in the second half of the first funding period, the effect of a defined fiber product on modification of the microbiome and metabolome will be studied using the unique research platform of the enable Cluster under strictly controlled conditions.

Coordinating Investigator

Prof. Dr. med. Hans Hauner

Technische Universität München
Lehrstuhl für Ernährungsmedizin

Email: hans.hauner@tum.de 

PD Dr. med. Thomas Skurk

Technische Universität München
Lehrstuhl für Ernährungsmedizin

Email: thomas.skurk@tum.de

Partners

PD Dr. Peter Eisner

Fraunhofer-Institut für Verfahrenstechnik und Verpackung IVV

Email: peter.eisner[at]ivv.fraunhofer.de

Prof. Dr. Hannelore Daniel
Prof. Dr. Dirk Haller
Dr. Thomas Clavel

Technische Universität München
Email: daniel[at]tum.de
Email: dirk.haller[at]tum.de
Email: thomas.clavel[at]tum.de

Jürgen Sieg

J. Rettenmaier & Söhne GmbH & Co KG
Email: juergen.sieg[at]jrs.de