Systematic review and meta-analysis of the effect of increased vegetable and fruit consumption on body weight and energy intake

BMC Public Health

Cliona Ni Mhurchu¹  Peter Scarborough³  Helen Eyles¹  Kelechi Nnoaham²  Oliver T Mytton³ 

[1] National Institute for Health Innovation, School of Population Health, University of Auckland, Auckland, New Zealand;Plymouth City Council, Armada Way, Plymouth, UK;British Heart Foundation Health Promotion Research Group, Nuffield Department of Population Health, University of Oxford, Oxford, UK

关键词: Nutrition;    Adiposity;    Trials;    Energy intake;    Obesity;    Body weight;    Fruit;    Vegetable;   

Others  :  1128150
DOI  :  10.1186/1471-2458-14-886

 received in 2014-01-23, accepted in 2014-07-29,  发布年份 2014

【 摘 要 】

Background

Increased vegetable and fruit consumption is encouraged to promote health, including the maintenance of a healthy body weight. Population health strategies (e.g. 5-A-Day or similar campaigns and subsidies on vegetables or fruit) that emphasize increased consumption may theoretically lead to increased energy intake and weight gain.

Methods

We undertook a systematic review of trials that sought to increase vegetable and fruit consumption, in the absence of advice or specific encouragement to remove other foods from the diet, to understand the effect on body weight and energy intake. We included only randomised controlled trials. We pooled data using a random effects model for two outcomes: change in body weight and change in energy intake. Sensitivity and secondary analyses were also undertaken, including a one-study removed analysis and analysis by study sub-type to explore sources of heterogeneity.

Results

A total of eight studies, including 1026 participants, were identified for inclusion in the review. The mean study duration was 14.7 weeks (range four to 52 weeks). The mean difference in vegetable and fruit consumption between arms was 133 g (range 50 g to 456 g). The mean change in body weight was 0.68 kg (95% CI: 0.15-1.20; n = 8; I² for heterogeneity = 83%, p = 0.01) less in the “high vegetable and fruit” intake arms than in the “low vegetable and fruit intake” arms. There was no significant difference in measured change daily energy intake between the two arms (368 kJ; 95% CI: -27 to 762, comparing high vs low; n = 6; I² = 42%, p = 0.07).

Conclusion

Promoting increased fruit and vegetable consumption, in the absence of specific advice to decrease consumption of other foods, appears unlikely to lead to weight gain in the short-term and may have a role in weight maintenance or loss. Longer studies or other methods are needed to understand the long-term effects on weight maintenance and loss.

【 授权许可】

   
2014 Mytton et al.; licensee BioMed Central Ltd.

【 图 表 】

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