The Role of Healthy Fats in a Fitness Diet When it comes to fitness and nutrition, healthy fats often get a bad reputation. However, healthy fats are essential for your body’s overall function and play a vital role in supporting muscle growth, energy production, and overall health. Here’s a closer look at the role of healthy fats in your fitness diet. 1. Avocados: Nutrient-Dense Healthy Fats Avocados are rich in monounsaturated fats, which are heart-healthy and provide long-lasting energy.