In: Economics
Itemize tax deductions are mainly used to decrease taxable income. Mortgage payments entail a large amount and tax savings on account of it are just a miniscule part of it. Consumer interest is a small amount and can be used for any purpose, in case of mortgage payments, the government is aware that it is only being used for this specific purpose.
It is true that lunch is a personal expense, however if a person is travelling, than the person should charge the company as the rates might differ where he is travelling for work, he won't spend an excess amount on food as the company has made him travel, he doesn't have an option to carry food as food is perishable, so it is quite fair that he should take money from the company for lunch.
Personal appearance is subject to what the company feels a person should do or not, if he or she is valuable to the company and the company needs that person to be presentable, than it is fair that they should charge the company.
The nurse was quite right if it is certain that the education did not train her for any other job, and as the knowledge which she gained couldn't be used anywhere else, than it is justifiable that she charged the company.