Help, adult rabbits are extremely thin. What happened?

Rabbits can eat, but they are thin. There are generally two reasons: 1. Incorrect food leads to malnutrition in rabbits. For example, if you only feed vegetables, this will definitely not work. Rabbits must eat grass, rabbit food, enough water and vegetables. If the rabbit is still a baby rabbit, that's why. 2. There are intestinal parasites. Although intestinal parasites are a common phenomenon in animals, including people, if there are worms in the stomach, it will indeed cause rabbits to lose weight continuously. If the rabbit hair is messy, it means that the rabbit is now in an unhealthy state. Healthy rabbits have very smooth and shiny back hair. 3. If you are a novice rabbit breeder, please be sure to learn the knowledge of rabbit breeding and feed rabbits with the right food: grass as the main food, rabbit food as the supplement, plenty of water and proper amount of vegetables. If the rabbit has just been bought for a few days, please be sure to prevent coccidiosis as soon as possible, which is related to whether the rabbit can survive. Prevention of coccidiosis is the most important thing in a rabbit's life.