What is the primary function of dietary fat?

The primary function of dietary fat is to provide energy and support cell structure. Fats are a crucial macronutrient that serve as a concentrated source of energy, supplying approximately nine calories per gram—more than double the energy provided by carbohydrates and proteins. This makes fats an essential component of a balanced diet, especially for individuals with higher energy needs.

In addition to providing energy, dietary fats play a vital role in supporting cell structure. They are integral components of cell membranes, which are primarily made up of phospholipids and cholesterol. These fats help maintain the integrity and fluidity of cell membranes, allowing for proper cell function and communication. Furthermore, fats are necessary for the absorption of fat-soluble vitamins (A, D, E, and K) and are involved in the production of hormones.

While dietary fats can also contribute to enhancing flavor and taste in foods, this function is secondary to their essential roles in energy provision and cellular structure. Therefore, the comprehensive contribution of fats to both energy needs and the structural integrity of cells underscores why the correct answer is focused on these primary functions.