> For instance, nobody knows how each body adapts to a high-carb/high-tech diet over a decade of training. They just hope for the best.

I think this is where Nutritional Genetics could help tremendously. I went under anesthesia for a colonoscopy and my blood sugar dropped so low they had to give me a glucose infusion. That is how they discovered I have a partial CPT1A Deficiency. Apparently anesthesia inhibits fatty acid oxidation which led them to get me tested for the disorder. Knowing I had this changed my diet completely and has helped me in my recovery.