Why do people think eating junk food makes you fart, I personally think eating healthy while it is good for you makes you fart way more?

Now I would like to think we are all mature enough to answer this question without being nasty about it. What do you think makes a person fart more? This is a serious question so don't be mean about it.
Healthy food.
Junk food.
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Why do people think eating junk food makes you fart, I personally think eating healthy while it is good for you makes you fart way more?
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