What degree of malabsorption can be expected with a proximal RNY?

I read on here once that proximal RNYs experience a 30% malabsorption rate. I was surprised to see such a high number as I had always considered the small amount of intestine bypassed with the proximal to deem the malabsorptive side of the surgery insignificant. If we are looking at 30% of the food passing undigested, does that mean if I am eating 900 calories a day that only 600 are being absorbed? Likewise that would mean I should up my protein and vitamin intake by 30% so as I abosrb the correct amounts right?

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