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But won’t RS feed the bad guys too?

According to the evidence collected so far it will not. In fact the opposite seems to be the case, in that it feeds primarily the beneficial bacteria and crowds out/inhibits the more dangerous Proteobacteria such as E.coli, Salmonella, Vibrio and Helicobactera.

Benefits of Resistant Starch: (long list)

— decreased glycemic response (in both healthy subjects and diabetics)
— increased insulin sensitivity
— improved fasting blood sugar (10 or 15 point drops in many individuals, sometimes even greater)
— increased satiety
— improved metabolism
— improved fat burning
— improvement of adipose tissue patterning (body fat)
— improved sleep (deep and “movie-like” vivid dreams)
— improved digestion
— improved regularity
— improved blood/lipid profiles
— improved chelation/elimination of heavy metals
— improved colon pH (acidic is better)
— improved uptake/absorption of vitamins and minerals
— improved neurotransmitters (like serotonin)
— improved butyrate and Short-Chain Fatty Acid production (by feeding butyrate producing bacteria)
— improved colon health (by the production of Short-Chain Fatty Acids)
— improved previous damage to colonocytes
— improved mucosal integrity (gut barrier)
— protection against (experimental) colorectal cancer
— increased nitrogen disposal and reduced blood urea concentrations
— improved eye health
— improved body temperature
— reduced stress and improved well being (anecdotal)
— potential treatment for ulcerative colitis
— does not affect one’s ability to maintain ketosis (if that’s desired)

In the body zinc is required amongst other things for growth and healing and is more essential to cells with a rapid turnover. The cells of the small intestinal mucosa have an extremely rapid turnover, being replaced about every four days, so zinc is extremely important to the integrity of the intestinal lining. Clinical studies have shown that zinc supplementation can help heal leaky gut in Crohn's disease patients, Crohn's is an illness with a lot of evidence to support the role of leaky gut syndrome6. To underline it's importance, zinc is easily depleted in the body and Dr. Keith Eaton working for Biolab, London has found zinc to be one of the most common nutritional deficiencies in people with dysbiosis/leaky gut syndrome7.