Nice and clean. In the spirit of constructive criticism: Make the post text a little darker Fix the alignment of the search box Change the header to something diet related You can add some great images from sxc.hu
That theme is tight, but says nothing visually that it has anything to do with health, dieting, etc. That floral design doesn't really fit, the colors don't really fit... Perhaps add images to the posts, it may help, but I'd look for a new theme and a logo that screams your topic. Content that is there looks pretty good, couple typos (spel chek ), keep adding. I would incorporate some bolds and italics where appropriate to break up the text, such as bolding the "Drop that fat:", etc. in your 2nd article. Also there are no hyperlinks anywhere in your posts yet that point to more info, other pages, or products to purchase.
Although some would say the theme looks ok, but for me, I feel it doesn't match your health niche. Usually I often come across health sites in white color but final choices is still up to you. Another thing is that you should consider doing is adding images to your posts because it looks quite dull without them.