Detoxification can cause this as stuff going back in to the bloodstream and needs to be eliminated. Well there are only a few elimination routes so only so much can be expelled by the normal primary means. So some excess will be excreted through the skin.
Intake of too much protein also contributes to Body Odor since the body can only utilize about 90 grams of protein daily. Anything above that is waste to the body and is broken down creating a lot of ammonia compounds in the process. Some of the excess ammonia compounds will be pushed out through the skin where bacteria reacts on it releasing ammonia vapors.
Increase your water intake, and remember the zinc if you are not already taking it. Zinc is great for reducing Body Odor . And cut back on your protein intake, including the kefir. Your flora should be pretty well established by now so you can cut back and focus on feeding them with the fibers instead.