There is reliable research that suggests that older adults need slightly more protein than younger adults do. A somewhat higher protein intake, especially when combined with resistance training can build muscle in older adults. This increased muscle can help to offset the muscle loss that is a part of the aging process. Muscle loss can increase the risk of falls and keep older people from doing the tasks they’d like to do.VRG Blog – https://www.vrg.org/blog/2022/02/03/protein-for-older-adults/
The latest data from a decades-long health survey finds that—yet again—the vast majority of Americans have a poor diet and many of us are inactive. Specifically, just 10 percent of Americans eat enough vegetables, and only 12 percent eat enough fruit, according to recent responses to the CDC’s survey, the Behavioral Risk Factor Surveillance system. Recent responses also reveal that 25 percent of Americans don’t do any exercise outside of any work activity.90% of the US Has a Poor Diet — https://arstechnica.com/science/2022/01/even-before-covid-americans-were-failing-at-health-basics-diet-exercise/
Lee SH, Moore LV, Park S, Harris DM, Blanck HM. Adults Meeting Fruit and Vegetable Intake Recommendations — United States, 2019. MMWR Morb Mortal Wkly Rep 2022;71:1–9. DOI: http://dx.doi.org/10.15585/mmwr.mm7101a1
In this cross-sectional study of 10 837 adults aged 65 years or older in the National Health and Nutrition Examination Survey, the mean primary American Heart Association score had a significant 8% decrease. The proportion of older US adults with poor diet quality significantly increased from 51% to 61%, and the proportion with intermediate diet quality significantly decreased from 49% to 39%; the proportion of older US adults with ideal diet quality remained consistently low. These findings suggest that diet quality decreased among older US adults from 2001 to 2018.Trends in Diet Quality Among Older US Adults From 2001 to 2018 — https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2789924
To say most of us know very little about nutrition would be an understatement.