Women aged 50-79 who had a diet higher in protein had better physical performance at baseline and a slower decline over 7 years. These conclusions come from a sub study of the Women's Health Initiative Clinical Trials and Observations Study. Protein intake was evaluated using food frequency questionnaire data and sample 24-hour urinary nitrogen collection and doubly labeled water. Function was evaluated using grip strength, number of chair stands in 15 seconds, and a timed walk. It is difficult to say whether eating protein makes you strong, or if your strong your body craves more protein. In any case, you do need adequate protein to build muscles. Most sources recommend at least 20% of calories should come from protein. This study population had a daily protein intake that averaged anywhere from 6.6% of calories to 22.3% percent of calories. So many older women are not getting enough protein.
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