Here's why:
* "Glycaemic" is a British spelling, while in American English, we use "glycemic".
* The word "difficult" should be capitalized because it's the first word in a sentence.
* Instead of using two words ("it is"), it's more common to use a single word in American English: "However,".
* Finally, the phrase "good health" is more idiomatic and natural-sounding in American English than "mainaining good health". [end of text]