A long-awaited expert update on the dietary changes needed to support both human and planetary health comes out clearly in favour of a plant-based approach. EAT-Lancet Commission says a shift towards its planetary health diet could prevent 40,000 early deaths a day across the world and cut agricultural methane emissions by 15 per cent by 2050.

The diet promotes more vegetables, fruits, whole grains, legumes and nuts, with only modest amounts of meat, fish, poultry and dairy. If you imagine a plate, half would be filled with vegetables and fruit (more vegetables). Most of the remaining half would be whole grains and plant proteins. There's room for small amounts of animal products and healthy fats, but very little added sugar. Butter doesn't get a mention.