Posted as supplied by author.

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W3 Department of Health. Choosing health: making healthier choices easier. London: Stationery Office, 2004.

W4 Department of Health. Choosing a Better Diet – a food and health action plan. London: Stationery Office, 2005.

W5 Hill JO, Sallis JF, Peters JC. Economic analysis of eating and physical activity: a next step for research and policy change. Amer J Prevent Med 2004;27(3S):111-116.

W6 America on the Move. www.americaonthemove.org