I thought I had my nutrition dialed in. After two decades of competitive athletics, coaching, and writing about wellness, I could recite my macros in my sleep. Protein? Covered. Carbs? Timed to perfection around training. Fats? Avocado, olive oil, almonds — all the right sources. But there was one number on my daily tracker that I kept glossing over, week after week, the same way you skip a stretch you know you should do. Fiber. And it turns out, that single oversight was quietly shaping how my body processed everything else I was putting into it. It wasn’t until a…