A person who is trained in the science of nutrition is a Nutritionist
Well, she says in a book that she runs outside as much as she can (must help, lol) She also gives the advice " Don't think about how much you eat, but about what you eat"
A person who gives unwanted advice is usually called a kibitzer.
If the person is paid for the advice, she/he is a counselor or personal coach. If the person gives unsolicited advice and is not paid, she/he is called a nuisance.
A doctor who gives advice on proper body maintenance is known as physician.
The advice that he usually gives is to not read his books.
It's a section in a newspaper that asks for question and gives out advice.
she gives him advice on how to attack the greece
There isn't any good sites that gives good advice. The best advice is to get the information in person from a good person that you know and trust. You can go into a chat room or Facebook but they aren't good sites for advice.
An assistant :p
She gives him advice and a scarf.
Absolutely, in fact, eating an apple before exercising gives you extra energy. But, I advice you to eat an apple maybe 30-40 minutes before running not right before running.
http://www.lapbandsurgery.net/ has lots of great information about diets after weight loss surgery. It gives you advice on things to eat and what to avoid.