Breakfast is food that you eat in the morning. This can be toast, ceral, pancakes or anything that your feeling like. Make sure you have a good breakfast as it sets you up for the rest of the day.
Pour carrot juice. After its done pouring, go back to the table and a bunny will appear at the bottom left corner. Click on it and you get the " Breakfast for a Bunny" achievement.
No not really because you have to your dinner .The name 'breakfast' actually means 'to break your fast' i.e. your period of not eating overnight. So if you don't eat until noon, it's breakfast.