I love it when you see alignment in what Lewis called the Tao. So, in Confucian practice there is apparently the custom of whispering to one's self before eating: Hari hachi bu. It's a reminder to self to eat mindfully and stop when you are 80% full. It's rather the antithesis of the Hobbitlike "filling in the corners."
And then you pick up the Philokalia and check out the words of Blessed John Cassian summarizing the wisdom of the fathers when it comes to fasting: "They (the holy fathers) have not given us one single rule for fasting or a single standard and measure for eating, because not everyone has the same strength; age, illness, or delicacy of body create differences. But they have given us all a single goal: avoid over-eating and filling of our bellies." (On the Eight Vices)
Science, of course, explains a bit of the physical wisdom in this: we simply don't register how full we are as we are eating. It takes time for the belly to send the message to the brain: Enough! And if you eat quickly and till you are full, the message will come along too late.
Fasting this Lent? How about that wisdom from the Fathers being the first and foremost goal as you train your body that you do not live by bread alone, but by every Word that proceeds from the mouth of God: slow down and take time as you eat (avoid eat standing or on the go) and don't eat till you're full. Stop before the sense of satiety kicks in.