Lengths of proximal and distal? I don't want to be stuck needing a revision later on

Is the rule of thumb, the longer the better? I've also read that the longer the bypass, the greater the chance of malabsorbing vitamins. I've also heard that some people with a proximal RYN have to have a revision to distal RNY because they are not losing enough weight. Is the correct? Please help me out with information on this topic. Many thanks in advance to all. And no "my bypass is longer than your bypass" envy baiting, please. LOL

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