Nikki Sharp has some good guidelines for detoxing and eating healthily - which will help any body shape. http://www.staysharpbestrong.com/
Sophie Guidolin also has some good guidelines - and a body to be envious of http://sophieguidolin.com.au/
The Sinus Survival Guide is also a good read and echoes all of the healthy eating journals.

Three big things I changed: No Dairy produce, No Breads / Yeast and trying hard to cut out refined sugars (or added sugars). Im still eating as much as before but also enjoying 'Rainbow' meals with multicoloured fruits, veg, salads and yes meat and fish (but the quantity is lower).

In reality eating healthily and exercising the core and upper body will have an influence. The best core strengthening is to lay on your back and lift the legs - whilst keeping the stomach in. Slow controlled situps also work - the aim is to be controlled with the movements otherwise the wrong muscle groups are used. Doing Yoga will help you regain flexibility as over training the abs will be detrimental to the elegance of tail and back...

Certainly all these aspects helped me - and the bloating I used get regularly has gone. Indeed my stomach almost disappeared whilst my weight stayed a consistent 60kg (1m74).