According to Bragg's Apple Cider Vinegar, it is good for EVERYTHING. My brother, who has arthritis, told me to drink a mixture of vinegar, water, and honey every morning and that it would help alleviate the stiffness of my arthritis. He swears it has helped him. I did buy some, but so far I have just been using it in my salad dressing.
As for fries, I haven't tried that yet. My daughters dip their fries in a mixture of mayonaise and mustard. They dip their pizza in ranch dressing. I keep telling them that pizza is fattening enough without adding ranch dressing to it. Oh well, to each his own.