Lars had a history of depression. but one day, he wakes up feeling very energetic. inspired to paint, he spends three straight days productively creating works of art. he sleeps very little; he says that he doesn't need sleep because he's not at all tired. it is likely that lars is suffering from what?

Bipolar disorder

Explanation:

Bipolar disorder is a mental condition in which affects the moods of the individual. It swings from one mood to another.

This condition is known as manic depression. There are many symptoms of bipolar disorder. The person might not feel like sleeping for some days but after few weeks he might sleep more.

Symptoms are: episodes of depression, feeling very high, overactive. It can lasts for several weeks or days.

i think she would gain 18 grams