The Goat That Doesn't Eat Beef

My troubled girlfriend told me about eating beef again.  She had quitted eating beef for a decade.  Recently, she had a lot of problems.  Her doctor, her mum and some articles talk about problems when you don't eat beef for a long time.  Deficiency of this and that...

Her eagerness worries me.  I challenge her few theories.

She said no-beef made her lacked certain nutrients.
There's no one particular nutrient one can get from only beef except mad-cow disease.
She said no-beef made her disliked food rich in iron (or something).
I ask her if she likes oyster. She said she couldn't eat oyster everyday. I said that's not my point, no-beef did not make her not like food rich in iron. She changed her statement.  She said she meant she didn't have enough iron. Spinach has iron.

I said if there is any side effect from no-beef, it should have happened after 3 years of no-beef life.

I warned her with examples of my vegetarian friend who once tried beef made her sick (throw up).  I said don't try a steak right away.

I bet she got pissed with my negative attitude of her new finding to improve her poor situation.

It's not about the beef.  How can beef create all these troubles?  The beef thing only brings out her desperateness of getting rid of those troubles.  It takes a long time to generate these problems and it then takes time to get things straight.  There's no better way to tackle a problem by facing it.