The States of Guernsey has approved the island's new obesity strategy and funds for most of its recommendations.
Health and Social Services' proposals had 27 recommendations including taking on new dieticians and working with businesses to promote healthy living.
Minister Hunter Adam said treating obesity could bankrupt his department in the future if action was not taken.
Deputy Adam said it was vital that Guernsey acted now on what was a growing problem.
He said he hoped further funding would become available at a later date so all the recommendations could be rolled out.
Deputy Mike O'Hara said he believes the initial investment recommended in the strategy could end up saving money in the long term.
He said: "Ill health should not be measured only in financial terms but also in the wider impact on individuals and families.
"Bearing in mind the savings that this strategy will be making we should not be scraping around for money now."