Imagine for one moment that your body is a restaurant. In the restaurant, people order what they want from a menu, and waiters take these orders to the kitchen where they are processed. On a regular restaurant visit, the cooks in the kitchen will make the dish requested, add or subtract any special requests, and return the dish to the waiters to have it served to hungry customers.
Now imagine the people in this scenario as cells, sending a chemical message to let other parts of the body know that something - oxygen, nutrients, etc., is required. Normally the transport across the body is swift and cells are happy, having all their needs met. Likewise, in the restaurant, patrons will have their bellies full in a timely fashion.
Now, visualize that the waiters are delayed in delivering the food to the tables because there is a standing-room only cocktail party which is nearly filled to capacity in the exact path they need to travel. Or the restaurant has added 20 more tables as a trial, leaving the room for waiters to squeeze through minimal at best...
The two scenarios of "things that could delay your meal" making you, the hungry customer, quite unhappy, refer to increasing the density in the room, whether it be by more people or tables in the path of the waiters.
Fast forward to a typical day in your life, however, on this day, you are so busy at work that although you have eaten 3 square meals, you have not had a chance to drink much water, you missed your lunchtime walk and have been parked at your desk for the majority of the day. It is almost 100% certain that you will not feel good that day.
This is because although your body has taken in all the nutrients it needs for that day, if there is not enough hydration/water consumption or movement from you, those waiter cells are going to be stuck in quicksand, and will have difficulty bringing your order to the kitchen, or bringing your plate of food back to your body's cells. The nutrients your cells need will have a very difficult time getting to where they need to be because of the increase in density of the surrounding tissues. This is most detrimental in times of injury, dehydration, or prolonged couch-potato behaviour!
Therefore, ensure you are drinking water, moving frequently while injured or not injured, to make sure your body's orders are being filled and delivered. There's nothing worse than thinking you are a healthy person, since you eat healthy, when your body is actually deprived of many of its essential nutrients due to a bodily traffic jam. This will also speed up healing after an injury, and be helpful for your long-term health.