What is a key component of a healthful diet?
The diet is colorful
Organic foods are excluded in the diet
Whole foods are featured in the diet.
The foods in the diet are nutrient-dense
The Correct Answer is D
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. While iron plays a role in certain enzymatic reactions in the body, its primary function is not directly related to nervous system function. Nervous system health depends on other nutrients like B vitamins, particularly B12.
B. Iron is essential for oxygen transport in the body. It is a key component of hemoglobin in red blood cells and myoglobin in muscle cells. Hemoglobin binds oxygen in the lungs and carries it to tissues throughout the body, while myoglobin stores and delivers oxygen within muscle cells, supporting energy production during physical activity. Adequate iron is critical for endurance, performance, and preventing fatigue. Iron deficiency can lead to anemia, decreased oxygen-carrying capacity, and impaired physical performance.
C. Iron is not directly used to generate energy from carbohydrates. Carbohydrates are metabolized via glycolysis and the Krebs cycle to produce ATP, but iron’s role is indirect, mainly as a component of hemoglobin and iron-containing enzymes that support oxidative metabolism.
D. While iron deficiency can indirectly affect blood oxygenation and overall cardiovascular function, iron does not directly maintain blood volume or blood pressure. Blood volume is regulated by water balance and electrolytes, while blood pressure depends on vascular resistance, cardiac output, and fluid status.
Correct Answer is A
Explanation
A. The onset of menstruation (menarche) in adolescent females results in regular blood loss each month, increasing iron requirements to replace lost hemoglobin and prevent iron-deficiency anemia. This is the primary physiological reason adolescent girls need more iron than their male peers. Adequate iron intake is essential for oxygen transport, energy metabolism, and proper growth during adolescence.
B. Rapid skeletal growth occurs in both adolescent males and females, but it is not the main reason for higher iron needs in females. Bone growth primarily requires calcium, phosphorus, and vitamin D rather than iron.
C. Basal metabolic rate (BMR) may fluctuate during adolescence, but a decline in BMR does not increase iron requirements. Iron needs are linked to blood production, not changes in metabolism.
D. While thyroid hormones regulate metabolism, their increased production is not the primary factor driving higher iron requirements in adolescent females.
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