A plant-based diet plan for endurance athletes is really not all that different from a normal (healthy) diet, with the exception, of course, of the meat and animal products. If you're switching from eating McDonald's every day, then sure, it's going to take some getting used to. But if you eat lots of nutritious, whole foods as it is, there really aren't all that many adjustments you need to make to go vegetarian, and from there, to go plant-based.
You...