Vitamins A, D, E & K are fat soluble vitamins and Vitamin B & C are water soluble vitamins. 

The fat soluble vitamins can be stored in the body fat and can be utilised for the body metabolism as and when required. Whereas the water soluble vitamins B & C  can not be stored by the body for too long and any excess is excreted in the urine, hence we need to take these vitamins (B & C) on regularly.

Long term consumption of antibiotics can result in deficiency of Vitamin K in the body.  

Bile is required for absorption of Vitamin K. In case of jaundice or patients with gall stones, there may be obstruction to the flow of bile from the liver and this can lead to deficiency of Vitamin K.

Vitamin A is derived from carotenes present in various foods. There are  different types of carotenes available in the food and of these β-carotenes are the richest sources of vitamin A.