Products claiming to be high in protein are filling up Singapore's supermarket shelves as a result of a booming fitness culture, but health experts warn that not all proteins are created equal.  Walk into any supermarket in Singapore today and the word "protein" is hard to miss.  Alongside the usual fresh food suspects of chicken, salmon and eggs – which most shoppers would readily recognise as high in protein – a multitude of other products sit on the shelves, vying for your attention. From