Obesity and undernutrition are among the three biggest threats to the global population according to a report in the medical journal The Lancet.

Together with climate change, these are the biggest threats to the world's population, and are driven by profit motives and policy inertia, according to The Global Syndemic of Obesity, Undernutrition, and Climate Change: The Lancet Commission report.

According to the Commission, the three pandemics constitute a syndemic, or synergy of epidemics, because they co-occur in time and place, interact with each other to produce complex sequelae, and share common underlying societal drivers.

The Lancet's Commission is calling for a radical trillion-dollar binding plan to rethink of business models, food systems, civil society involvement, and national and international governance to address these issues.