There are lots of different opinions today when it comes to added energy sources for performance horses. Here is one to consider that I feel makes the most sense:
The horse evolved as a grazing herd animal. All of their nutritional needs were met by the ground that they stood upon, and if predation was light, and water plentiful they may not travel at a faster pace than a trot for most of their life. In ideal conditions, they thrived and their energy demands were easily met. I guess you could say that life was good.
