A review.Inulin and oligofructose are the best- documented prebiotics.By interacting with the gut ecosystem, inulin and oligofructose influence a number of physiol. functions, and the health benefits of these ingredients were demonstrated to extend outside the strict environment of the gut.In fact, much attention has recently been focused on their potential health benefits towards weight management.Several animal studies have shown that inulin and oligofructose are able to modulate the expression (and release) of gastrointestinal hormones involved in appetite regulation, with a concomitant lower body weight and adipose tissue gain.In parallel, since recent research has suggested a role for the gut microflora in energy homeostasis, exptl. data have investigated the potential role of prebiotics in this context.Ingestion of a high-fat diet by mice was associated with changes in the microflora composition (e.g. decreased bifidobacteria), higher circulating LPS levels, and hence, was responsible for inducing an inflammatory state, as well as weight gain.In this model, the addition of oligofructose suppressed most of the metabolic alterations caused by the high-fat diet, and these effects were linked to a restoration of bifidobacteria levels.In humans, effects of prebiotics on appetite and energy intake were shown in healthy volunteers.Oligofructose supplementation resulted in lower daily energy intake together with various influences on appetite ratings.Adolescents receiving oligofructose-enriched inulin (Orafti Synergyl) during 1 yr had a lower body weight and body fat mass, as well as an appropriate body mass index (BMI) compared to the control group.Ultimately, data from a recent study demonstrate the ability of oligofructose supplementation to decrease body weight and energy intake in overweight and obese subjects.All together, these findings highlight exciting perspectives for the use of inulin and oligofructose as functional food ingredients in foods designed for weight management.