A gluten-free diet can lead to nutritional deficiencies, especially if not followed properly. Gluten-free products may lack essential nutrients such as fiber, iron, calcium, and B vitamins, which are commonly found in gluten-containing grains. To avoid deficiencies, it is important to consume a balanced diet with a variety of naturally gluten-free whole foods, such as fruits, vegetables, lean proteins, and gluten-free grains.