Does lean protein powder aid in weight loss?

I use it in smoothies (protein powder) like today, I used Less than 1 cup of peanut butter, half a banana and ice. I saw that recipe on line that says it helps lose weight. But, I also read an article online about protein powder saying it makes you GAIN weight. Opinions please? Thank you.
Protein powder helps you lose weight
Makes you gain weight
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Does lean protein powder aid in weight loss?
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