What the Heck Is reduced sugar horse feed?

https://horse-feed-pellets139.capitaljays.com/posts/what-horse-feed-is-best-for-horses-with-sensitivities

Gentle horse feed for sensitive stomachs, designed to support digestive comfort, hind gut health and easy nutrient absorption. A reduced-starch high-fibre formula with natural components to help maintain calm digestion and overall health.