What the Heck Is balanced horse feed?

http://news.latestusfinancialnews.com/story/570332/with-half-of-britains-horses-overweight-bifid-launches-grainfree-lowsugar-feed-for-the-nations-gooddoers.html

Gentle horse feed for sensitive stomachs, designed to support digestive comfort, hindgut health and better nutrient absorption. A reduced-starch fiber-rich formula with natural components to help maintain settled digestion and overall health.