Depression causes a range of symptoms, which typically include many negative emotions, such as:
Hopelessness
Guilt
Self-loathing
Despair
Helplessness
Worthlessness
You might feel some or all of these emotions, and feel this way all or most of the time. You might also be tired and listless, have problems concentrating, find little or no pleasure in the activities you normally enjoy, and find getting through every day an endless struggle.
When it comes to food and sleep, you could find that your symptoms vary a great deal. For instance, some people sleep more, while some get insomnia. Some turn to food for comfort; others lose their appetite.
Living with depression makes life so bleak and joyless that trying to keep going starts to feel like a waste of time. However, there is a genuine light at the end of even the darkest tunnel if you get the right treatment.