The review finds that people in internet interventions improve their
diets, become more active, lose body weight, and reduce tobacco use and
excessive alcohol consumption.

It also finds that people in mobile
device interventions, such as smart phone apps or SMS messages, increase
their physical activity and and lose body weight.

Lead author Ashkan
Afshin, M.D., M.P.H., Sc.D. says programmes that have features such as
goal-setting and self-monitoring are particularly effective.

The authors
warn that most studies lasted less than six months, meaning there was
little information on long-term behavioural changes.

Also, most studies
were conducted in high-income countries with volunteers who were
generally more educated and motivated than the wider public.