Bummed by how much they underused Bortas when it came to New Horizons. Feel like they wanted to put Seth’s new girlfriend in the limelight so ignored more established characters.
Its still completely plausible IMO.
He never showed big interest in Klingon cuisine until he met Jadzia. He was raised by his humans, probably with human food. He might not even know that his bowel movements are irregular/unusual, since talking about shit isnt exactly a topic of honor he would discuss with other Klingons. And he always lead a pretty conservative lifestyle, avoiding change whenever possible. Why should he randomly change to a klingon diet?
His mom mentions learning to make Klingon food for him, particularly blood pie. He was probably eating a mix of human and klingon stuff on the Enterprise. Of course, since a good amount of klingon food is served live, his options for good klingon food from the replicator were limited.