What effect has soy protein been linked to regarding testosterone levels?

Soy protein has been linked to lower testosterone levels, and this is supported by various studies that have examined the effect of phytoestrogens, particularly isoflavones found in soy, on hormone levels. Isoflavones can mimic estrogen in the body, which may lead to a hormonal balance that could suppress testosterone production in men. Some research indicates that higher soy protein intake can correlate with reduced testosterone levels, which is why this option is considered correct.

It's important to recognize the nuances in the research surrounding soy protein and its hormonal effects. While some studies show a significant impact, others may suggest minimal or no effect, leading to ongoing debates within the scientific community regarding the effects of soy on testosterone levels. The overall consensus leans towards soy having the potential to lower testosterone rather than increasing or causing fluctuations in its levels.

The other options present outcomes that are not widely supported by the current body of research, making the choice of lower testosterone levels the most accurate representation of what soy protein consumption can influence in regards to testosterone.