Out of the seven above, for me, the best camera overall is the Lumix. It's not the prettiest camera in the bunch and the plastic body is less than ideal, but the click of the shutter, the focusing speed, and sensor competed with the Nikon 7000 which is a "real SLR." Also, the body is $500 making it significantly cheaper.
Additionally, Hereford shares a few helpful tips for photographing food, including how to shoot in typical restaurant lighting ("turn the shutter to 1/30, the aperture as low as possible, and then adjust the ISO incrementally until the image looks good"), photographing food at home (use natural window as backlighting), and boosting contrast when relying upon a small sensor camera for dramatic effect.
But remember, Foodie Photographer, regardless of which camera you're carrying around during supper, be sure to "eat it before you tweet it"!
See the complete breakdown and photo samples at Bon Appetit's Road Test: Finding the Best Camera for Food Photos.
(Top photo by Will Hereford)