Marasmus is a very serious condition that happens when someone doesn't get enough good and healthy food to eat for a long time. This is a bit like when you forget to water a plant for a long time and the leaves start to droop and wither.
When someone has marasmus, their body doesn't have enough energy to do all the things it needs to do to work properly. This can make them very weak and sick, and they can even die if they don't get help soon enough.
People who have marasmus often look very skinny and bony, and their skin might look dry and wrinkled. Their body might be working so hard to keep them alive that they might feel very tired and not have any energy to play or do fun things.
But the good news is that marasmus is preventable! Making sure you have enough healthy foods to eat, like fruits, vegetables, and grains, can help keep you strong and healthy. It's important to eat a balanced diet with lots of different types of foods, so that your body can get all the vitamins and nutrients it needs to function well.