Answer: Major depression
Step-by-step explanation:
Major depression is the type of severe depression in which a person tends to feel despaired and sense of sadness majorly. Symptoms of this depression tend to last long as it is severe condition .Person experience anxiety non-enjoyable feeling in enjoyable acts,irritation, weight gain etc.
According to the question,Jacks is experiencing major depression as he is profoundly sad and in despair.He is not interested in playing golf which gave him happiness along with gaining more weight.