Excellent looking site. Really like the style and layout. There are one or two very small things that need attention, such as the "Top Authors" text overlapping at the footer. But overall very nice looking site. You're in a fiercly competitive market so best of luck with the site. I hope you can manage to work your way up the rankings.

However, so far as making it more appealing is concerned, I would suggest perhaps a large graphic at the top of the homepage, showing something weight loss related?

I have actually just started a fitness and exercise site and would be happy to write some content for you, if you were open to reciprocating?

Anyway, overall I think your site looks good and has some good content. Just not enough pictures for me (but that is just a taste thing obviously).