Compositions useful for weight management in an animal are disclosed. The compositions comprise one or more isoflavones or isoflavone metabolites, and in some embodiments include conjugated linoleic acid, and/or L-carnitine. Also disclosed are methods useful for weight management in an animal utilizing compositions comprising one or more isoflavones, conjugated linoleic acid, and/or L-carnitine. Preferably, the compositions and methods employ a combination of one or more isoflavones, or a combination of one or more isoflavones in conjunction with conjugated linoleic acid, and L-carnitine.