Question: Why is the risk of toxicity from excessive intake of fat-soluble vitamins higher than excessive intake of water-soluble vitamins? Need Assignment Help? a. Fat-soluble vitamins are not excreted in the urine like water-soluble vitamins, but builds up in tissues b. Fat-soluble vitamins contains heavy metals which can be toxic c. Fat-soluble vitamins are processed through more complex metabolic processes than water-soluble vitamins d. Fat-soluble vitamins are needed in much smaller amounts than water-soluble vitamins