Assistant Laboratory Animal Technician (ALAT) Practice Exam 2025 - Free ALAT Practice Questions and Study Guide

The correct answer is water-soluble vitamins. This group includes vitamins such as vitamin C and the B vitamins, which are not stored in significant amounts in the body. Because they are soluble in water, any excess that the body does not use is typically excreted through urine. As a result, a daily intake is necessary to maintain adequate levels and ensure proper physiological function.

In contrast, fat-soluble vitamins, such as vitamins A, D, E, and K, can be stored in the body's fatty tissues and liver, allowing for a greater buffer against daily fluctuations in intake. Minerals, while also essential nutrients, include both those that are stored in the body and required in varying daily amounts. Proteins are macronutrients important for numerous biological functions, including tissue repair and enzyme function, but they do not fall into the category of vitamins. Therefore, focusing on water-soluble vitamins is key, as they necessitate ongoing consumption to meet the body's needs.