This paper reviews and compares four leading healthy diet metrics: GDQS, GDR score, MDD-W, and Nova UPF score, for their accuracy, ease of use, and global applicability in monitoring dietary quality. The findings highlight that the Minimum Dietary Diversity for Women (MDD-W) offers the strongest predictive accuracy for nutrient adequacy using a simple, scalable method, while also emphasizing the need for further research on metrics assessing moderation and cross-country comparability.