can you really build protein just from powdered whey/soy?

I wouldn't think it's possible to build a lot of muscle using mostly just powdered whey/soy and vitamins. I would imagine you need lots and lots of real food. However it seems my experience is being to the contrary:

At the moment I am supposedly doing a cut but I am consuming lots of powdered whey/soy. It seems from the scale, the mirror, and from the fact that I am objectively getting stronger, that I am building muscle.

This is confusing to me because I didn't think I'm eating enough for it to be happening. I would imagine powdered whey/soy can help curb muscle losses, but I didn't think it's "real" food, and if you look up "what do you eat" from literally anyone, no one's video says "16 scoops of whey, that's what. Boring as ****."

Well, if I am in fact getting stronger and building muscle, that's the only consistent source of protein that's doing it. My other sources of protein don't reach my protein requirement.

Has anyone here actually consistently done that over 2-3 years? I mean going through 10-20 lbs of whey powder a month, for years on end, and putting in five pounds of muscle per year?

It is hard to believe that a protein powder can be a viable primary source of muscle nutrition, and in all the youtube videos about diet I don't see a single shake - only just mention of it. Then again, I don't see any needles in those videos either, even when I look up people who are well beyond natty, so maybe a shake just isn't very photogenic, and it can be the primary source of protein but no one talks about it.

Anyone use it like that? Can it really be "enough", or all you need for muscle nutrition?

(One note is that I do always try to eat some kind of fiber/vegetables. My thinking is only just protein shake, without any vegetables or fiber, would lead to protein farts and constipation. But vegetables aren't a source of protein, hence my question.)


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