Look, Ive studied it, Ive thought about it, Ive worked it out.
Go to an Op Shop or Antique store. Look at the size of the plates.
What are those things that are smaller than a dinner plate but larger than a plate used for toast?
They are actually dinner plates from the 50s!
Our plates are now twice the size they used to be, so are the bowls. My cereal bowl is like a bucket, one from the 50s is like a desert bowl, but a desert bowl now is like a spaghetti bowl, and a spag bowl this week is like a chamber pot!
I know if you came to my house and the food didnt cover the plate, you would think I was a Scrooge.
So its all a psychological thing. Combine this with the adage "you must eat everything on your plate" and we can see why its hard to eat "healthy".
Eat whatever you like, but lessen the size of the plate. Give it a few weeks and you will be amazed at how your appetite reduces. Its all in the mind!