If switching to natural greases doesn't satisfy your “fat-tooth”,
maybe its the potato in the French fries that your body craves.
Plain, pure starch. Do you also love bread and pasta (more pure
starch though very inferior to potatoes)? Pure starch is very easy
to digest and has a large adsorptive capability for toxins. In fact,
if any family member should accidentally eat something
poisonous, drinking cornstarch will quickly mop it up and keep it
stuck so it can't enter your tissues. (This doesn't work for all
poisons.) By craving pure starches, your body could be telling
you about a need to improve your digestion (liver disorders) or
to eat and breathe less toxic things.
Maybe a stomach-full of baby Ascaris is telling you to eat
only food that doesn't need a lot of acid: "just potatoes, bread and
pasta, please, and skip the sauce.” Ascaris inhibits acid production
by the stomach. This can result in an aversion to meat.
It doesn't take much acid to digest pure starch and get it on its
way out of the stomach. And out of the stomach means relief:
relief of the pressure on the diaphragm and liver, heartburn, that
too-full feeling, and other digestive disturbances.