Final answer:
A characteristic of a healthy diet is the balance and appropriate consumption of nutrients, while overconsumption of single nutrients can compromise health and is not recommended.
Step-by-step explanation:
The characteristic that is NOT a feature of a healthy diet is the overconsumption of any single nutrient, which can compromise health. A healthy diet should be balanced, offering adequate amounts of each essential nutrient without an excess. A healthy diet emphasizes whole foods, a balance of nutrients, calorie control, moderation, and variety. It should not include rapid weight loss promises, restrictions to certain body parts, or the claim to work without exercise, which are signs of a fad diet. Diets that suggest eating large amounts of one type of food, such as high-protein diets, may lead to other health issues like kidney stones and are not considered balanced or healthful.