Reverri EJ, et al. – This investigation probed the satiety effects of adding fiber to a mixed meal versus using beans (Phaseolus vulgaris) as a source of intrinsic fiber in the meal, in men and women with metabolic syndrome. The inclusion of whole black beans into a meal exhibited acute beneficial metabolic and GI hormone responses in adults with metabolic syndrome. These were given preference over the addition of equivalent amounts of fiber from a supplement.

Methods

• The enrollment included 12 men and women with metabolic syndrome.
• They were randomly assigned to eat three standard meals in a crossover design on three different occasions that contained either no added fiber (control (NF)), extrinsic or added fiber (AF), or whole black beans as the source of intrinsic fiber (BN).
• Meals were matched for energy and macronutrient composition.
• Five hour postprandial subjective satiety was estimated along with blood glucose, insulin, and the GI hormones, cholecystokinin (CCK) and peptide tyrosine tyrosine (PYY_3-36).

Results

• It was found that all meals induced fullness to a similar degree.
• Nonetheless, the AF meal suppressed prospective consumption (F_2,187 = 9.05, P = 0.0002) compared to the BN or NF meals.
• The NF meal displayed the tendency of increased satisfaction than the BN meal (F_2,187 = 5.91, P = 0.003).
• The BN meal yielded notably higher postprandial CCK concentrations compared to the AF (F_2,187 = 6.82, P = 0.001) and NF meals (F_2,187 = 6.82, P = 0.002).
• Similar results were disclosed for PYY_3-36 response for BN > AF meal (F_2,170 = 9.11, P < 0.0001).
• Postprandial insulin appeared to be markedly reduced after the BN meal, compared to the NF (F_2,187 = 22.36, P < 0.0001) meal.