Low Carb - Low GI Equine Formula Do you have a horse that is prone to Obesity, Insulin Resistance, Laminitis, Cushings, Equine Metabolic Syndrome or Tying Up? Do you know what to feed these horses? The answer to these questions is the Hygain wonder diet. The wonder diet is high in soluble fibre (35%), fortified with vitamins and minerals and has the lowest starch content (1.5%) of any complete feed on the market.