How many calories are in 1 gram of aspartame or peptides in general?

Aspartame contains about 4 calories per gram, similar to many proteins. However, because it is used in such small amounts as a sweetener, its caloric contribution is negligible in practical applications. In contrast, peptides generally contain about 4 calories per gram as they are derived from proteins, but the specific caloric content can vary depending on the amino acid composition.