A full 86 percent of the global premature non-communicable diseases deaths happen in low- and lower middle-income countries, the study says.
WHO report, timed to coincide with World Cancer Day, says investment of $25 billion over the next decade could save seven million lives from cancer.
The United Nations agency, issuing its first such guidelines, said under-fives should also be physically active and get adequate sleep to help develop good lifelong habits and prevent obesity and other diseases in later life.
More than half of all countries likely to fail in reducing early deaths from a quartet of chronic diseases by a third before 2030, researchers say.
World Health Organisation director-general Tedros Ghebreyesus appointed Zimbabwe President Robert Mugabe as a goodwill ambassador on non-communicable diseases so he can "influence his peers in his region."
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