Question 5

They are good sources of calcium and protein, which are needed for bone and tissue growth.

A healthy diet contributes essential nutrients that support various bodily functions, and option D specifically highlights the importance of calcium and protein in promoting bone and tissue growth.

A) They are good sources of iron, which increases the absorption of fat into the red blood cells

While iron is crucial for transporting oxygen in the blood, this option incorrectly states its role. Iron does not increase fat absorption; rather, it is vital for the formation of hemoglobin. Therefore, this option is misleading in the context of a healthy diet.

B) They provide glucose, which is the only source of energy used by the brain

This statement is partially correct, as glucose is a primary energy source for the brain, but it overlooks other important nutrients that also contribute to brain function. Moreover, stating it as "the only source" is inaccurate, as the brain can utilize ketones and lactate as alternative energy sources. Thus, this option is not comprehensive enough to define a healthy diet.

C) They provide thiamin, which is necessary for carbohydrate metabolism

Thiamin is indeed important for carbohydrate metabolism, but this statement alone does not encompass the broader aspects of a healthy diet. While thiamin contributes to overall health, it is just one of many nutrients required for a balanced diet, making this option insufficient.

D) They are good sources of calcium and protein, which are needed for bone and tissue growth

This option accurately identifies calcium and protein as vital nutrients in a healthy diet, essential for maintaining strong bones and supporting tissue growth. This comprehensive view aligns with nutritional guidelines emphasizing the importance of these nutrients.

Conclusion

Option D is the most comprehensive and accurate statement regarding contributions to a healthy diet, highlighting the significance of calcium and protein for bone and tissue health. The other options either misrepresent the nutrients' roles or fail to provide a holistic view of dietary needs, reinforcing why D stands out as the best choice.