Aging-related changes in protein and fat intake and their related meal types factors by longitudinal birth cohort analysis using the National Health and Nutrition Survey in Japan from 2001 to 2019

The increase of protein intake and protein-to-energy ratio and fat intake and fat-to-energy ratio over time observed among Japanese adults may be related to the increased intake of food groups from noodle type meals. Thus, considering the type of staple food (i.e., rice, noodles, or bread) and its combination with other foods when adhering to a balanced diet is necessary.