While I am a little leery about recommending soy for regular consumption. It has been found that the soy compound genistein provides more health benefits when consumed with sulforaphane, a chemical in broccoli. Another food that has high amounts of genistein is strawberries. So one might get the same synergistic effects from eating strawberries and broccoli together.
Interestingly, I did find this one article that mentioned that metabolism of genistein is dependent on the gut microflora. So getting your gut in shape for the proper metabolism of flavanoids is important.
The author writes, "It was proved that intestinal microflora plays an important role in the metabolism and bioavailability of isoflavones. It is considered that about 50% of Asians and 25% of nonAsians host the intestinal bacteria that convert daidzein into the isoflavonoid equol. Variation in individual metabolism of phytoestrogens due to differences in gut microlora might influence the serum concentration of phytoestrogens. It was found that the capacity to produce equol is higher among Japanese and Korean men than among American men. After an intake of 50 mg isolavone, the urinary excretion was 42% for daidzein and 16% for genistein. " (1)
1) New Insights Regarding the Potential Health Benefits of Isoflavones (23 August 2017) by Corina Danciu, Diana Antal, Florina Ardelean, et al.