My cat is about 13 years old (I guess). He has lost some weight in the
past few years. I'm sorry that I didn't keep a better record of his
weight - too cheap to buy  a digital scales the right size.

For the past year or so he'll have periods of feeling, apparently,
very well, and eating around 2 cans of cat food a day. He had to have
his molars taken out and has a hard time with dry kibble. He will eat
some if he's very hungry, I guess he just swallows it whole.

Then, suddenly, he'll have a spell of refusing to eat for up to a
week, and losing weight. Once I took him to vet and he got a steroid
shot that rejuvenated him for a while. I've heard this is hard on
liver and other organs though.

His last session of this ran from Sunday to Thursday. He didn't seem
to want to drink much either.  I tried to tempt him with all his
favorite human foods. He would act hungry, then eat a few mouthfuls
and walk away. On Thursday he finally got going and ate about a half
can of tuna fish. After that he wanted tuna and refused anything else.
Finally a week later, he is back on his feed and polished off a full
can of Iam's Ocean Sea Food this morning.

Does anyone have any idea what might cause these seemingly cyclical
bouts of fasting?
EArl