The answer is b: Soy foods contain phytochemical compounds called phytoestrogens that modulate hormone activity in the body.
Explanation for each option:
a. Bananas - Incorrect. Bananas are not known for containing significant amounts of phytoestrogens. They are more commonly recognized for their potassium content.
b. Soy foods - Correct. Soy foods, such as tofu, soy milk, and edamame, are rich in phytoestrogens, particularly isoflavones, which can mimic or modulate the activity of estrogen in the body.
c. Broccoli sprouts - Incorrect. While broccoli sprouts contain various beneficial compounds, they are not particularly known for phytoestrogens. They are more noted for their high levels of sulforaphane, a compound with potential cancer-fighting properties.
d. Grapes - Incorrect. Grapes contain various antioxidants and other beneficial compounds, but they are not a significant source of phytoestrogens.
In summary, soy foods are the correct answer as they are well-known for their phytoestrogen content.