Skip to main page content
Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
Randomized Controlled Trial
. 2011 Jun;26(3):309-15.
doi: 10.1177/0884533611405992.

Dietary Adherence to Long-Term Controlled Feeding in a Calorie-Restriction Study in Overweight Men and Women

Affiliations
Free PMC article
Randomized Controlled Trial

Dietary Adherence to Long-Term Controlled Feeding in a Calorie-Restriction Study in Overweight Men and Women

Emilia Addison Machado Moreira et al. Nutr Clin Pract. .
Free PMC article

Abstract

Background: The success of clinical dietary interventions depends on the motivation and willingness of study participants to adhere to the prescribed or provided diet. The aim of this study was to assess participants' adherence to their provided diet over the 6-month duration of the Comprehensive Assessment of Long-term Effects of Reducing Intake of Energy (CALERIE).

Methods: Investigators assessed the dietary adherence of 46 men and women who completed the first phase of the CALERIE trial. Volunteers were randomized to 1 of 4 dietary intervention groups: control, calorie restriction, calorie restriction with exercise, and low-calorie diet. Participants were provided with foods during 2 weeks of baseline and during the first 12 weeks and the last 2 weeks of the intervention as outpatients, and they completed a daily self-report form to assess diet adherence. The data are expressed as mean ± standard deviation or standard error of the mean. Pearson's correlation coefficient was determined to examine the relationship between assigned energy levels and total energy intake.

Results: Deviations reported were for eating nonstudy foods as well as not eating study foods. There were few deviations, and when converted to mean calories per day these did not affect total energy (weeks -3 to 2 = 10.25 ± 4.82, weeks 1-4 = 9.93 ± 12.52, weeks 5-11 = 8.38 ± 7.42, weeks 22-23 = 0.53 ± 3.97 kcal/d). The associations between assigned energy level and actual intake were high for all groups (P = .001), weeks -3 to -2 (r = 0.999), weeks 1-4 (r = 0.998), weeks 5-11 (r = 0.999), and weeks 22-23 (r = 0.998).

Conclusions: The data provide evidence that dietary adherence is good when all foods are provided and when participants are highly motivated.

Figures

Figure 1
Figure 1
Study design.
Figure 2
Figure 2
Change in weight by periods and treatment
Figure 3
Figure 3
Number of participants in each intervention group who reported nonadherence to the diet by study period
Figure 4
Figure 4
Comparison of actual energy intake and assigned energy intake for each participant by study period. All participants received control diet during baseline (Wks −3–2) prior to randomization. CR= Calorie Restriction; CREX= Calorie Restriction and Exercise; LCD= Low-Calorie Diet

Similar articles

See all similar articles

Cited by 7 articles

See all "Cited by" articles

Publication types

Feedback