Site: http://3fatchicks.com

This is a fun and helpful weight loss community run by three sisters (Suzanne, Jennifer, and Amy). Three Fat Chicks started as personal website helping each other battle their weight problems. Over time it blossomed into a public site featuring: diet reviews, an awesome forum, calculators and other tools, diet tips, fitness articles, recipes, cooking tips, free diet blogs for users, member journals, and plus size resources.

You can tell the website comes from a genuine place. What is truly special about the site is the support forum. It's very active, helpful, and lovingly supportive. Which is exactly what you want in a support forum.