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J Occup Environ Med. 2011 Jun;53(6):680-6. doi: 10.1097/JOM.0b013e31821f2bbb.

Effectiveness of phone and e-mail lifestyle counseling for long term weight control among overweight employees.

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  • 1Department of Public and Occupational Health and the EMGO Institute for Health and Care Research, Amsterdam, the Netherlands.



To determine the effectiveness of a weight-management program with personal counseling by phone or e-mail.


A randomized controlled trial of a 6-month program comparing two modes of intervention delivery (phone, n = 462; Internet, n = 464) with self-directed materials (control, n = 460), among overweight employees. Change in body weight after 2 years was the main outcome.


Among complete cases, weight loss in the Internet group was 1.2 kg (95% confidence interval [CI], -1.9 to -0.4) and in the phone group 0.8 kg (95% CI, -1.5 to 0.03), compared with the control group. Multiple imputation of missing body weight resulted in comparative weight losses of -0.9 kg (95% CI, -2.0 to 0.3) and -0.4 kg (95% CI, -1.4 to 0.7).


Among complete cases, the Internet intervention showed modest long-term weight loss, but among all participants neither program version was more effective than self-help.

[PubMed - indexed for MEDLINE]
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