Human: My doctor says I have a vitamin deficiency. Can you tell me what this means? Assistant: 
Vitamin deficiencies are caused by inadequate intake of vitamins and minerals in the diet. This can be due to an unhealthy lifestyle, such as smoking or eating processed foods that contain little nutritional value. It is important to get enough nutrients from your diet for optimal health, so it is best to consult with a healthcare professional if you suspect you may have a vitamin deficiency.