Soy protein isolate is the major poteinaceous fraction from dehulled soybeans by removing the majority of non-protein components. Soy protein is much harder to digest than meat, and is considered a cheap, poor quality protein filler. Soy is highly allergenic, causing problems for any animals and contains some enzyme inhibitors which impede protein digestion. Most soy is also genetically modified (see GM), which makes its long term effects impossible to predict.