Association Between Dietary Protein Intake and Hand Grip Strength in Older Adults

The Impact of Aging on Muscle Mass

A recent study published in PLoS ONE has explored the connection between dietary protein intake and hand grip strength among older adults. Aging is associated with a decline in muscle mass, leading to increased morbidity and mortality risks. To mitigate this loss, healthcare professionals advocate for regular moderate-intensity physical activities and adequate protein consumption.

Understanding Protein Intake Patterns

While dietary protein is essential for developing a robust muscular framework, research has yielded inconsistent results regarding its effects. Studies indicate that not only the total protein intake but also the timing and distribution of protein consumption play significant roles. This background has prompted further research to ascertain the optimal amount of protein to be consumed at each meal.

Study Overview and Methodology

The PLoS ONE study evaluated the relationship between grip strength, total protein intake, and the distribution of protein across daily meals in older adults. This retrospective analysis utilized data from 4,123 participants aged over 50 from the national survey “What We Eat in America.” Researchers calculated the daily protein intake and its distribution per meal, comparing grip strength (measured in kilograms) between individuals consuming 25g or more of protein at one meal versus those consuming the same amount across multiple meals.

Key Findings

The study revealed that 33% of men and 19% of women consumed 25g of protein at two or more meals. Notably, no significant correlation was found between the frequency of high protein consumption and grip strength across all age groups. However, among women, grip strength showed a positive association with higher total daily protein intake, regardless of whether the protein was consumed at once or spread throughout the day. This correlation in men diminished when adjusting for factors such as age, ethnicity, and smoking status.

Conclusions and Future Research

The authors concluded that a higher daily protein intake correlates positively with grip strength in women over 50 years old. Further investigation is necessary to clarify these findings and deepen the understanding of the relationship between grip strength and protein consumption in the aging population.

Reference

Mishra S, Goldman JD, Sahyoun NR, Moshfegh AJ (2018) Association between dietary protein intake and grip strength among adults aged 51 years and over: What We Eat in America, National Health and Nutrition Examination Survey 2011-2014. PLoS ONE 13(1): e0191368. https://doi.org/10.1371/journal.pone.0191368