A weight management system comprises a cash register, a user client and a weight management module, coupled via a wide area network. At least one context-dependent profile is defined, and a set of options determined by the profile is generated. A digitally watermarked image I\u2032 is obtained by embedding the first check bits in the LSBs of the corresponding pixel data of the digital image data. The inelastic strap sections are flat, multi-ply straps and the elastic section comprises two spaced-apart elastic cords, each cord stitched or otherwise secured at opposite ends to the respective first and second inelastic strap sections.