I read that Diet Coke and Diet Sprite have a high GI. Why is that, as they contain only artificial sweetener?
Diet soft drinks made with alternative sweeteners contain so little carbohydrate their GI can’t be tested – it is negligible. So we wouldn’t trust any source that tells you they have a high GI. Regular Coca-Cola tested following the standardised international method has a low GI (53) as does regular Schweppes lemonade (GI 54). Regular Fanta has a medium GI (68).