Soybeans are a pretty stellar food for protein per calorie.

And to stop misinformation in its tracks:

> A March 2021 meta-analysis published in Reproductive Toxicology concluded that neither soy protein nor isoflavone intake significantly affects reproductive hormone levels in men. Analyzing data from 41 studies and 1,753 participants, the researchers found no statistically significant effects on testosterone or estrogen regardless of intake dose or duration.

so Gemini says, link - https://pubmed.ncbi.nlm.nih.gov/33383165/