Our character is governed by our food habits. If you look at saints (to put it rightly, sanyasis) they always eat less , particularly they avoid taking tamasic foods because as that would induce "feelings" inside the brain.
The perfect ratio of eating is : solid portion should occupy one-half, One fourth should be occupied by water, other one fourth should be left empty .
Never drink water immediately after your food . wait for one hour to consume water. Allow food to be digested in that gap of one hour.
Wait for another 4 hours to go for lunch. Try to finish off your before 7 p.m.