What the Heck Is low calorie horse feed?

http://easternindianewsmagazine.in//story/143666/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, intestinal health and better nutrient absorption. A low sugar fiber-rich formula with naturally sourced ingredients to help maintain calm digestion and overall health.