Greek yoghurt compared to Greek style yoghurt whats the difference? Greek yoghurt per 100g has 60 cals, 10g protein 3.1g sugar it is made from one ingredient: milk. This is strained to remove excess water and whey. This leaves a thick, nutrient dense yoghurt. Greek style yoghurt has 121 cals per 100g, 2.8g protein, 3.3g sugar it is thickened with milk powder or artificial thickeners to obtain the same texture as Greek yoghurt without any additional nutrients but more calories and less protein.