If the cat has suddenly changed his behavior, then I'd worry about a
medical issue. Diabetes often starts this way.
Cats who are getting high quality food, and don't have starvation
issues, usually don't need their food supervised. I keep a low carb
dry food available all the time, and feed canned twice a day.
A cat with starvation issues has to be fed to satiation. If it were
easy to ignore hunger, we would not have a booming diet industry. It
is a signal that cannot be ignored.
Cats with deprivation problems must decide when they are confident the
food will keep coming. Trying too much to head off a cat's appetitite
can lead to stress and behavior problems. >> Stay informed about: Cat wont stop eating