Potential benefits of improved protein intake in older people

The Impact of Whey Protein Supplementation on Sarcopenia Progression among the Elderly: A Systematic Review and Meta-Analysis

We conducted a systematic literature review and meta-analysis to investigate the role of whey protein supplementation in the functioning of the elderly with sarcopenia. The aim was to investigate the available scientific evidence and determine the best recommendations with respect to whey protein supplementation in sarcopenic patients. Methods: Databases, including CINAHL, Embase PubMed, and Web of Science, were searched from database inception until 31 December 2022 for randomised controlled trials (RCTs) comparing the efficacy of whey protein supplementation in the elderly with sarcopenia. Data on study design, risk of bias, patient, illness, and treatment characteristics from each study were independently extracted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA). The tool "assessing risk of bias" from the Cochrane Handbook was used to evaluate the quality of the included papers. Results: The search identified 629 records; 590 articles were excluded as duplicates or after evaluation at the title or abstract level. Out of 39 full-text articles that were reviewed, 29 were excluded for not fulfilling the inclusion criteria. There is some evidence that whey protein supplementation combined with age-appropriate physical exercise might improve muscle mass and lower limb function in the elderly with sarcopenia. The present meta-analysis demonstrated overall that whey supplementation does not improve any of the tested sarcopenia-linked parameters. However, we found that study duration (weeks) and age significantly affect the handgrip strength rate and the chair and stand test rate, respectively, so consideration should be given to oral supplementation combined with the age of participants and an appropriate physical activity as a form of sarcopenia prevention in the high-risk group.

The Effects of Cow-Milk Protein Supplementation in Elderly Population: Systematic Review and Narrative Synthesis

BACKGROUND

To review currently available evidence on the effect of cow-milk proteins supplementation (CPS) on health in the elderly.

METHODS

Five electronic databases (Pubmed, Web of Science, Embase, Cochrane Library, ClinicalTrials.gov) were searched for studies about CPS among older people. All types of publications were included, with the exception of systematic reviews, meta-analyses, opinion letters, editorials, case reports, conference abstracts and comments. An additional search in Google Scholar and a manual review of the reference lists were performed.

RESULTS

Overall, 103 studies were included. Several studies explored the role of CPS in the preservation or improvement of muscle mass among healthy subjects (40 studies) and pre-frail, frail or sarcopenic patients (14), with evidence of beneficial effects. Other studies assessed the effect of CPS on bones (12), cardiovascular disease (8), inflamm-aging (7), chronic pulmonary disease (4), neurocognitive function (4), and vaccines (2), with weak evidence of positive effects. Seven studies in the field of protein metabolism investigated the role of CPS as an important contributor to nutritional needs. Other investigational areas are considered in the last five studies.

CONCLUSIONS

The beneficial effects of CPS in achieving aged-related nutritional goals, in preserving muscle mass and in recovering after hospitalization may be particularly relevant in the elderly.

Older Australians' perceptions and practices in relation to a healthy diet for old age: a qualitative study

OBJECTIVE

To explore older independently-living Australians' perceptions and practices about what constitutes a healthy diet for older people.

DESIGN

Qualitative methodology, focus groups.

SETTING

Independently-living retirees in Northern NSW, Australia.

PARTICIPANTS

A total of 29 participants in five focus groups, ranging in age from 60-93 years, with a mean age of 73.3 ± 8.8years; the majority (79%) were women.

RESULTS

Thematic analysis of the focus group interviews revealed four themes that best represent older people's perceptions and practices in relation to healthy eating for old age. These included: 1) healthy foods - participants believed in a hierarchy of perceived healthfulness or importance of foods; 2) quantity - participants believed that ageing was associated with a reduced dietary intake and less need for meat; 3) personal circumstances - participants acknowledged that food costs, social situations and health conditions influenced their food choices; and 4) good intention - participants acknowledged that the desire to regain or maintain wellbeing and to preserve health positively influenced their food choices. Participants were unaware of the national nutrient targets for older Australians.

CONCLUSION

The trend towards reduced dietary intake of meat and the indifference to dairy products expressed by many participants in this study suggests that they are at risk of not achieving the requirements for protein and calcium in particular. Failure to meet these age-adjusted nutrient targets has important implications for the health and functional capacity of older people.

High rate of deficiency in the amino acids tryptophan and histidine in people with wounds: implication for nutrient targeting in wound management--a pilot study

BACKGROUND

Malnutrition resulting from inadequate protein, energy, or micronutrient intake has been identified as an independent risk factor for the development of pressure ulcers in older adult patients and is associated with increased morbidity and death.

OBJECTIVE

To assess the relationship between albumin, the standard biochemical marker of nutritional adequacy, and amino acid status in people with wounds.

METHODS

The authors performed tests for serum albumin, prealbumin, and amino acid profiles on 18 consecutive hospital patients with wounds and 7 patients without wounds.

RESULTS

A low level of the essential amino acids tryptophan and histidine was a common finding in older people with wounds. Of the 18 consecutive wound cases, 16 (88.9%) were found to be deficient in tryptophan, histidine, or both. Moreover, levels were generally found to be lower than those in the group without wounds. The levels of all other amino acids were essentially normal for all patients. Finally, although serum albumin is often used as a surrogate marker of amino acid adequacy or nutritional status, clinically abnormal albumin had poor specificity (63.2%), poor sensitivity (60.7%), and low positive predictive value (70.8%) for the identification of a low tryptophan or histidine level.

CONCLUSIONS

People with wounds are a relatively at-risk group and are likely to be overlooked in terms of micronutrient deficiencies, and these findings have important implications in terms of potential specific targeting of nutrient supplementation.