What the Heck Is low starch feed for horses?

https://horse-feed-pellets139.capitaljays.com/posts/equine-feed-for-digestive-health-what-to-choose-and-why-it-matters

Gentle horse feed for sensitive stomachs, designed to support digestive comfort, intestinal health and easy nutrient absorption. A low-starch fiber-rich formula with natural components to help maintain settled digestion and general wellbeing.