Glucomannan has been associated with reductions in body weight and plasma lipid and glucose levels in adults in a
few clinical trials [14–19]. But these trials have been limited by weak designs, small sample sizes, heterogeneous diagnoses, variable formulations and dosages of glucomannan, and short duration of follow-up [20]. In contrast to these studies, we used a randomized, double-blind, placebo-controlled design to evaluate the safety and efficacy of 3.99 g/day of
glucomannan capsules in a sample of 53 healthy overweight and moderately obese adults consuming self-selected diets
and maintaining usual physical activity levels during an 8- week study period.