There are no studies that show greater harm in drinking vegetable juices over a long period of time. However, if you drink only vegetable juice for a long period of time it may lead to malnutrition. Although vegetable juice is rich in vitamins and fiber, if you drink only vegetable juice for a long time without choosing other foods, it may cause malnutrition, and the lack of nutrients will affect the normal development of the body. Every day’s diet should be balanced, at the same time to ensure adequate nutrition, so it is not recommended to drink vegetable juice for a long time. In addition, you should eat some fresh fruits, including bananas, strawberries, pineapples, kiwis, etc. You should also eat some meat, such as chicken, beef, fish, etc., to supplement the protein and calcium needed by the human body. If drinking vegetable juice for a long time causes malnutrition, you need to consult a doctor in time and have a reasonable diet under the doctor’s guidance.