"Part of our out-of-balance world still starves to death. Another part stuffs itself into a level of obesity," Margaret Chan, head of the World Health Organization (WHO), told delegates at the Second International Conference on Nutrition (CIN2) in Rome.
Representatives from 190 countries gathered 22 years after the first malnutrition meeting for a three-day conference organised by the UN food agency (FAO) and WHO, and boasting appearances from leaders including Pope Francis.
She called on countries across the world to "have the creativity to work with civil society, academics and the private sector to find the right solutions for good health".
A lot of progress has been made already, with the number of undernourished people in the world dropping by over half in the past two decades, from one billion people in 1992 when the first conference (CIN1) was held, to 805 million in 2014.
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"Our planet, ladies and gentlemen, is losing its capacity to sustain human life in good health. No one is predicting that population growth will outpace the productivity of the world's food systems. But this food must be health promoting," Chan said.
At the opening ceremony, the delegates adopted a "Rome Declaration on Nutrition" and "Framework for Action", which the FAO said were based on a consensus reached by over 200 national governments after consultations with civil society organisations and the private sector.
But FAO director general Jose Graziano da Silva told participants that "we're not at the finishing line yet.
"Our responsibility is to transform these commitments into concrete results. I hope that during this conference, you ministers will announce targets that even go beyond what we have already agreed," he said.
He said poor diet habits and access to food had "overwhelming human, social, environment and economic costs".