What the Heck Is low starch balancer?

https://daily-horse-feed498.zenbloomer.com/posts/what-horse-feed-is-best-for-horses-with-metabolic-issues

Gentle horse feed for sensitive stomachs, designed to support digestive comfort, hindgut health and better nutrient absorption. A low-starch high-fibre formula with natural components to help maintain calm digestion and overall wellbeing.