The Nutrition for Growth (N4G) Summit will take place in Paris in 2025. Following on from the summits in London in 2012 and Tokyo in 2021, this will be a major event given the scale of the issue, which covers obesity (more than 30% of humanity), malnutrition and undernutrition (more than 25% of humanity) and affects countries in both the North and the South. As well as being a global health issue, undernutrition affects the development of physical and cognitive capacities, and is therefore at the root of many other development problems. There is therefore an urgent need to take action and direct our resources towards this "mother of all battles".