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Andrew Steptoe a Department of Epidemiology and Public Health,
University College London, London WC1E 6BT, b Department of General
Practice and Primary Care, St George's Hospital Medical School, London
SW17 0RE
Correspondence to: A
Steptoe a.steptoe{at}ucl.ac.uk
Objective:
To measure the effect of brief behavioural counselling in general practice on patients' consumption of fruit and
vegetables in adults from a low income population.
What is already known on this topic
Biomarkers and intention to treat analyses have seldom been used in
such interventions, and few studies have targeted low income
populations What this study adds
Favourable effects were observed in low income adults living in a
deprived inner city area
Design:
Parallel group randomised controlled trial.
Setting:
Primary health centre in a deprived,
ethnically mixed inner city area.
Participants:
271 patients aged 18-70 years without
serious illness.
Intervention:
Brief individual behavioural
counselling based on the stage of change model; time matched nutrition
education counselling.
Main outcome measures:
Self reported number of
portions of fruit and vegetables eaten per day, plasma
carotene,
tocopherol, and ascorbic acid concentrations, and 24 hour urinary
potassium excretion. Assessment at baseline, eight weeks, and 12 months.
Results:
Consumption of fruit and vegetables
increased from baseline to 12 months by 1.5 and 0.9 portions per day in the behavioural and nutrition groups (mean difference 0.6 portions, 95% confidence interval 0.1 to 1.1). The proportion of participants eating five or more portions a day increased by 42% and 27% in the
two groups (mean difference 15%, 3% to 28%). Plasma
carotene and
tocopherol concentrations increased in both groups, but the rise in
carotene was greater in the behavioural group (mean difference 0.16 µmol/l, 0.001 µmol/l to 1.34 µmol/l). There were no changes in
plasma ascorbic acid concentrations or urinary potassium excretion.
Differences were maintained when analysis was restricted to the 177 participants with incomes
£400 (
596, $640) a week.
Conclusions:
Brief individual counselling in primary
care can elicit sustained increases in consumption of fruit and
vegetables in low income adults in the general population.
Brief interventions can be effective in increasing consumption of fruit
and vegetables
Compared with nutritional counselling, brief behavioural counselling
carried out by nurses in primary care led to greater increases in fruit
and vegetable intake and in plasma
carotene concentration
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