Idioms used in a short story (written by a German student)

Bob was sick as a dog. But after having fully recovered from his illness, Bob had a new lease on life. He took up work again, but his boss was a pain in the neck. After work Bob used to go for a walk, which did him a world of good. Just like that, he could recharge his batteries. After the walk he felt fresh as a daisy. After getting home from his walk, Bob had dinner. He used to eat fast food for dinner, but he kicked that habit and preferred to fix something himself. He knew “You are what you eat”.