This is similar to what I read in that equine magazine -
"The care for a horse diagnosed with laminitis can be at times very frustrating. Even horses under the best possible may not respond to care and/or recover fully. This is another reason why wild Mustangs may not have a high incidence of laminitis or founder. In the wild a lame horse has a low survival rate. Horses in the wild with weaknesses tend to breed less. Domesticated horses have no such circumstances since they are controlled and cared largely by man."
"..The more the horse goes back to a wild Mustang life, the better. Smaller meals spaced out over a period time so that the horse’s digestion is more natural."
"Movement is also important to digestion in a horse. Horses should take a bite of food then take a step. Repeat that same process over a period of eighteen hours a day. Again the wild Mustang eats poor nutritional forage yet covers long distances each day. The domesticated horse eats very high nutritional food (grains, grasses, hay) yet often travels very little distance compared the wild Mustang. Movement helps digestion, hoof wear (naturally trimming hoof to keep the coffin bone in proper position) and blood flow (increases nutrition to the hoof)."
(all found here: How to care for a horse with laminitis - by Matthew Brendal - Helium