bipolar loss of appetite

What is the difference between depression and bipolar disorder?
Sandness prolonged depression or unexplained crying spells, changes of appetite and sleep patterns, irriability, anger, agitation, worry, anxitey, pessimsim, indifference, loss of energy, persistent lethargy, unexplained pain, guilt, worthlessnes and / or hopleness, inability to enjoy former interests, social withdrawal, excessive alcohol consumption or use of chemicals and recurrent thoughts of death or suicide. Bipolar – Increased mental and physcial activity and energy, elevated mood, optimism exaggerated self-confidence, excessive irriability, aggressive behavior, decreased need for sleep with those who experience fatigue, delusions of grandeur, a sense inflated self-importance, the races of speech, racing thoughts, flight of ideas, impulsiveness, lack of trial, distractibilty, such as reckless overspending, rash business decisions, erratic driving and sexual indiscretions and the most severe cases, delusions and hallucinations
yoiu've replied the same, with bipolar has ups and downs, with only low depression.