A few examples of methodological issues of the studies
included few trials successfully controlled potential
confounding factors between study groups, few trials
described the methods of randomization or allocation
processes, none of RCTs blinded either experimental
group participants or the providers to diet
interventions; the various number of participants and
dropouts rates. The issue of subjectivity was involved
with the synthesis process of the studies and the
limitations of study methodological quality. These
findings highlight the need for improved research
designs in nursing research.