The 1990 Dietary Guidelines for Americans were the first edition to shift recommendations from negative 'avoid' wording to positive 'choose' wording and to introduce quantitative goals for total fat and saturated fat.
Sources
- The History and Future of Dietary Guidance in America - PMC (pmc.ncbi.nlm.nih.gov)
- https://ers.usda.gov/sites/default/files/_laserfiche/publications/42215/5831_aib750b_1_.pdf?v=35952 (ers.usda.gov)
- https://jn.nutrition.org/article/S0022-3166(22)14659-6/fulltext (jn.nutrition.org)