Sweeteners are additives with a sweet flavour that are added to foods as sugar substitutes. They are grouped by nutritional value into nutritive sweeteners such as polyols, which provide some calories, and non-nutritive sweeteners, usually many times sweeter than sucrose, such as aspartame, saccharin, acesulfame K, sucralose, and stevia. Widespread applications include low-calorie foods, soft drinks, and sugar-free products for diabetics and weight management. Each sweetener has its own taste profile, stability, and acceptable daily intake, and products must declare them on labels.