For the food actions to be changed to work like fluid actions so that you can go back and update when they have eaten more.
You can have it so that when someone documents the food when it has been given they can put the information in such as what the meal is, portion size ect. then once they have finished with the food staff can click on that action and update how much they have eaten with a percentage slider.
This will make the food intake more accurate and also more accurate to see how long an individual takes to eat.