http://www.ncbi.nlm.nih.gov/pubmed/19083431
Steam cooking significantly improved the in vitro bile acid binding of collard greens, kale, mustard greens, broccoli, green bell pepper, and cabbage compared with previously observed bile acid binding values for these vegetables raw (uncooked). Inclusion of steam-cooked collard greens, kale, mustard greens, broccoli, green bell pepper, and cabbage in our daily diet as health-promoting vegetables should be emphasized. These green/leafy vegetables, when consumed regularly after steam cooking, would lower the risk of cardiovascular disease and cancer, advance human nutrition research, and improve public health.
For MC'ers steaming something like broccoli works a bit like Cholestryamine, increasing bile acid binding acid (ie reducing WD)
This also helps to clear biotoxins from the gut.