The Health Star Rating (HSR) is an interpretive front-of-pack nutrition labelling system designed for packaged foods. Packaged foods are given a star rating of 0.5 to 5.0 stars in half star increments based on their overall nutrient profile score. The underpinning algorithm includes energy, risk nutrients (saturated fat; sodium; and total sugars), and positive nutrients (fibre; protein; and fruit, vegetable, nut and legume [FVNL] content). We assessed whether the HSR could be simplified, without materially changing its performance, by removing fibre and FVNL content, which are not mandatory on current nutrition labels.