chickens wont overeat .. if they get real hungry they can eat too fast lol, you can see them stretching their neck around trying to choke it down ... only time ive learned to take food and water away is at night for chicks still in the brooder box and old enough not to need the heat lamp 'indoors' we're talking .. if the box is covered in the evening, it keeps the draft off, they go right to sleep so they arnt keeping me up, and they dont make a wet stinky mess out of the feeder and waterer i have to fix in the morning .. i just wake up uncover them and drop the feeders back in and we're off to another productive day lol ... bonus is they start equating 'daddy' to the provider of food .. thats what we want around here lol ..