After reading Zeeshan's succinct answer below, I'm rewriting mine. (I would delete it, but I can't because it is accepted; so I'll see if I can add something.)
I'll use as an example a nutritionist (Charles) giving advice about nutrition to a couple of people (Alice and Bob). In this case, the question you describe wanting to ask might go:
They spoke to the nutritionist, looking for information regarding nutrition.
You could replace regarding with about or relating to, or pertaining to, for a few examples.
You could replace looking for with seeking, in search of, trying to find, wanting, hoping to find, or, notably, simply the word "for". Here are some correct sentences that have variations in meaning:
They approached a nutritionist to find out more about nutrition.
Alice and Bob talked to a professional, wanting to know more about nutrition.
They consulted him for wisdom pertaining to nutrition.
They met with a nutritionist for advice.
Alice and Bob had heard that Charles knew nutrition. Seeking more knowledge, they queried him about his field of expertise.
Many of these variations can be mixed and matched without a problem, but not all of them. Using answers is more restrictive. Some possibilities are:
They sought answers regarding nutrition.
They hoped to find answers to their questions relating to nutrition.
A nutritionist might not have all the answers in nutrition.
But "answers in nutrition" should be avoided in most cases. It doesn't really sound natural, usually. You could fix it up a bit by saying "answers in the field of" In my example it is fine because "having all the answers" is idiomatic. I'll give examples of using the idiom "has all the answers":
"Oh, he has all the answers," said Bob in exasperation. (sarcasm)
Don't look at me like I got all the answers! I'm as confused as you are. (the speaker is saying "don't ask me" (about a problem being discussed), I don't know!"
Mostly this idiom is used in informal speech, and often these constructions are used sarcastically.
But it might interest you that in those two examples, the phrase all the answers is essentially just a shortening of all the answers in life.
And I should mention uses like "She was looking for answers in a bottle of booze," - which basically means "She was getting drunk instead of trying to solve her problems" or "He looked for answers in his crystal ball.", which means he was literally looking into a glass sphere that a mystic might use to view things from far away. These uses cause a bit of confusion.
To sum up, I suggest that you avoid "answers in" to construct your example sentence, and when you see the phrase, try to figure out if it is proper, and if so, why.