Another benefit of fermented food is that, since they help to optimize intestinal flora, they play a key role in estrogen metabolism. If the "good"-to-"bad" bacteria ratio in your gut is off, you will likely have excess levels of estrogen, which of course, will result in lowered testosterone.
I thought about this thread as I was working on my e-book lastnight. Here's a quote from the e-book that relates to this topic:
"Of great importance in this fight against chemical castration is healthy intestinal flora. The first phase of estrogen-detoxification by the liver consists of a process called hydroxylation. This means that a hydroxyl (-OH) group is added to one of the carbon atoms on estrogen. When the intestinal flora is imbalanced (more putrefactive ['bad'] bacteria and yeasts than 'good' bacteria), the -OH group is added disproportionately to the '4-carbon' (creating 4-hydroxyestrone) and the '16-carbon' (creating 16-alpha hydroxyestrone). As we have seen, both these estrogens are considered bad estrogens, being linked to uncontrolled cell division—cancer. When gut flora has a higher friendly bacteria-to-bad bacteria ratio, it is the '2-carbon' that receives the –OH group in higher numbers. This creates more 2-hydroxyestrone, which protects against cancer.
If you have ever taken antibiotics or if you regularly shower in chlorinated water and/or drink chlorinated tap water, it is a virtual guarantee that you have imbalanced intestinal flora. Pharmaceutical antibiotics do not discriminate; they kill both beneficial and disease-causing bacteria. The key is the proper balance of good-to-bad bacteria... The optimal balance is 85 percent good bacteria to 15 percent bad bacteria. The scales will quickly tip in favor of bad bacteria if friendly bacteria get too low, which is what happens with a course of antibiotics. Chlorine also kills the friendly bacteria. Of course, chlorine is found in tap water, so if you drink this water regularly, you are killing your friendly bacteria. Furthermore, research has revealed that during a warm, ten-minute shower in unfiltered water, you will absorb more chlorine (in the form of inhaled chloroform) than if you were to drink eight glasses of tap water."
So here is another reason to include more fresh, homemade, fermented/cultured foods & drinks in your life.
AND QUIT WITH ALL THE GODDAMN UNFILTERED TAP WATER!!!