Food systems represent one-third of global greenhouse gas emissions. If left unchecked, these emissions would probably add enough extra warming to take Earth's average temperature beyond a 1.5°C rise in the 2060s.
The findings, headed by the University of Bristol, call into question the long-held view that people are indifferent to the energy content of the foods they eat and hence eat the same quantity of food whether it is high in energy or low in energy.