Even if someone were spending $5k on housing, how do you spend $5k on utilities and groceries (not dining out, it says groceries)? Also, not having a roommate

Even if someone were spending $5k on housing, how do you spend $5k on utilities and groceries (not dining out, it says groceries)? Also, not having a roommate straight out of college is typically a lifestyle bump in itself. Most people have roommates in college, so getting a place solo is an upgrade.