Registered dietitians have been surveyed on various food topics, including the healthiest salad dressing, peanut butter, and frozen fruit for smoothies, with unanimous agreement on their top choices. The same format of asking experts for their opinions has also been applied to other foods, such as hot dogs and coffee creamer. The responses from these dietitians suggest that certain food options may be considered healthier than others, but the specific details and recommendations vary by food category.