What is the oxygen-carrying protein found in red blood cells called?

A. While eating a variety of colorful fruits and vegetables can indicate a range of nutrients, color alone does not guarantee a healthful diet. A diet can be colorful but still high in added sugars, unhealthy fats, or processed foods.

B. Whether foods are organic or not does not determine the overall healthfulness of the diet. Both organic and conventionally grown foods can contribute to a balanced, nutritious diet. Excluding organic foods is not a key component of healthful eating.

C. Featuring whole foods—minimally processed foods like fruits, vegetables, whole grains, legumes, and lean proteins—is beneficial, but this alone does not fully define a healthful diet. Other factors, such as nutrient density and balance, are also critical.

D. Nutrient-dense foods provide a high amount of essential nutrients (vitamins, minerals, protein, fiber) relative to their calorie content. Choosing nutrient-dense foods helps ensure adequate nutrition while supporting healthy body weight and reducing the risk of chronic diseases. Examples include leafy greens, berries, lean proteins, whole grains, and legumes. Focusing on nutrient-dense foods is a cornerstone of a healthful diet.

A. The elderly and infants are at the highest risk for dehydration due to physiological factors. Infants have a higher body water content and a faster metabolism, making them more vulnerable to fluid loss during illness, fever, or hot weather. They also rely entirely on caregivers for fluid intake. Elderly adults have a reduced sense of thirst, decreased kidney function, and often take medications that affect fluid balance, which increases their susceptibility to dehydration.

B. While people with diabetes or cardiovascular disease may be at some risk for fluid imbalances, they are not universally at the highest risk for dehydration. Proper management of these conditions can reduce the likelihood of significant dehydration.

C. School-aged children are generally less vulnerable to dehydration than infants because they can communicate thirst and have more mature fluid-regulating mechanisms.

D. Athletes and adolescents can become dehydrated during intense exercise or heat exposure, but with proper hydration practices, the risk is lower compared to the physiologically vulnerable populations of infants and the elderly.