Why do I start the day with a flat tummy and end it with a huge one?

When you wake up in the morning you are taller because your back stretches and therefor your stomach will be flatter. Also your food has digested throughout the night. After you each your stomach will distend (get bigger). Throughout the day your spine will compress and your stomach will continually require food and stay bigger to allow for all the food. Also all your organs will slowly move into a different place. There is no way to keep the flat look throughout the day. Sorry