Unfortunately I rarely get french fries myself but I'll have to remember to try it out on the kitties when I next get them. One thing they go ape over is - raw egg. If I'm cooking and using an egg they go nuts - expecially Meka. I usually mix it up real good and give them a teaspoon or two. I was really afraid to do this since it was raw - they don't really care for cooked eggs - but Meka has had a problem with the hair on her back by her tail - she would pick it out or something and there was a bald spot there that just wouldn't go away - or it would start but then it would get bald further up her back and when some grew back there it was not in the color it should be but since the raw egg in the past two weeks she has hair all over her back and it looks good... Interesting.. Debbie