I have read on several web sites that guar gum is not good for cats and they even quote scientific studies: what is true?

Many times broad statements are made with little distinction made between different ingredients, because they sound very similar. Just because xanthan gum may not provide a benefit for cats, it may automatically be assumed that guar gum is no better. There have been hundreds of studies on guar gum and they have shown it safe and beneficial in both animals and humans. Guar is used for treating IBS, obesity, diabetes, reducing harmful cholesterol and preventing the hardening of arteries.