The researchers put mice on a diet and assessed which circuits in the brain changed. In particular, they examined a group of neurons in the hypothalamus, the AgRP neurons, which are known to control the feeling of hunger. They were able to show that the neuronal pathways that stimulate AgRP neurons sent increased signals when the mice were on a diet. This profound change in the brain could be detected for a long time after the diet.

Max Planck Institute for Biology of Ageing. “Dieting: Brain amplifies signal of hunger synapses: Possible target for drugs to combat the yo-yo effect.” ScienceDaily. http://www.sciencedaily.com/releases/2023/03/230324135218.htm (accessed March 28, 2023).