"eating junk" can be a noun itself. For example, "eating junk is bad for you".
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AnonymousHow can I turn this action "eating junk" into a noun?You can’t. A noun is a single word. Eating junk is two words: the verb eating and the noun junk as its object. You can, however, use the expression as you would a noun phrase (as a subject, object, etc.).
AnonymousHow can I turn this action "eating junk" into a noun phrase?He likes eating junk food.