The site focuses on three key areas; food, weight management programmes and obesity surgery.
It features advice from obesity medical expert Dr David Ashton, along with confidential social networking functionality.
Users will be invited to share their weight loss thoughts and experiences online when the site goes live later this month.
Registrants for the new Healthier Weight benefit card at will enjoy access to a special card holder area.
Card holders can access discounts on all Healthier Weight products, special food offers, a forum area, as well as exercise plans, tips, medical support and a help line.
All data collected will be used in an email CRM programme, also designed by twentysix Leeds.
"The virtual world provides the perfect environment for people dealing with the very sensitive issue of obesity, as it can provide instant help and information in a confidential way and on a one-to-one basis," said Chrissie Twigg, managing director, Healthier Weight.
The company appointed twentysix Leeds in May 2007 to refresh its website, create an e-marketing and CRM programme and promote the site online via PPC and SEO activity in a bid to raise conversion rates.