Article

Randomized trial of weight-loss-diets for young adults varying in fish and fish oil content.

Unit for Nutrition Research, Department of Food Science and Human Nutrition, Landspitali University Hospital, University of Iceland, Eiriksgata-29, 101 Reykjavik, Iceland.
International Journal of Obesity (impact factor: 4.69). 11/2007; 31(10):1560-6. DOI:10.1038/sj.ijo.0803643 pp.1560-6
Source: PubMed

ABSTRACT To investigate the effect of including seafood and fish oils, as part of an energy-restricted diet, on weight loss in young overweight adults.
Randomized controlled trial of energy-restricted diet varying in fish and fish oil content was followed for 8 weeks. Subjects were randomized to one of four groups: (1) control (sunflower oil capsules, no seafood); (2) lean fish (3 x 150 g portions of cod/week); (3) fatty fish (3 x 150 g portions of salmon/week); (4) fish oil (DHA/EPA capsules, no seafood). The macronutrient composition of the diets was similar between the groups and the capsule groups, were single-blinded.
A total of 324 men and women aged 20-40 years, BMI 27.5-32.5 kg/m(2) from Iceland, Spain and Ireland.
Anthropometric data were collected at baseline, midpoint and endpoint. Confounding factors were accounted for, with linear models, for repeated measures with two-way interactions. The most important interactions for weight loss were (diet x energy intake), (gender x diet) and (gender x initial-weight).
An average man in the study (95 kg at baseline receiving 1600 kcal/day) was estimated to lose 3.55 kg (95% CI, 3.14-3.97) (1); 4.35 kg (95% CI, 3.94-4.75) (2); 4.50 kg (95% CI, 4.13-4.87) (3) and 4.96 kg (95% CI, 4.53-5.40) on diet (4) in 4 weeks, from baseline to midpoint. The weight-loss from midpoint to endpoint was 0.45 (0.41-0.49) times the observed weight loss from baseline to midpoint. The diets did not differ in their effect on weight loss in women. Changes in measures of body composition were in line with changes in body weight.
In young, overweight men, the inclusion of either lean or fatty fish, or fish oil as part of an energy-restricted diet resulted in approximately 1 kg more weight loss after 4 weeks, than did a similar diet without seafood or supplement of marine origin. The addition of seafood to a nutritionally balanced energy-restricted diet may boost weight loss.

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    PLoS ONE 01/2012; 7(8):e43764. · 4.09 Impact Factor
Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.

Keywords

4 weeks
 
average man
 
body composition
 
body weight
 
capsule groups
 
DHA/EPA capsules
 
energy-restricted diet
 
fatty fish
 
fish oil
 
gender x diet
 
gender x initial-weight
 
linear models
 
macronutrient composition
 
nutritionally balanced energy-restricted diet
 
observed weight loss
 
overweight men
 
similar diet
 
sunflower oil capsules
 
weight loss
 
young overweight adults