To further support detoxification during your fast, I recommend using a near-infrared sauna, which will help eliminate toxins through your sweat. An entire chapter of KetoFast is dedicated to the use of sauna, with specific do’s and don’ts.
For more details on the science of near-infrared saunas, see “How to Achieve Superior Detoxification and Health Benefits With Near-Infrared Light,” which features my interview with Brian Richards, founder of SaunaSpace. A near-infrared sauna with low electromagnetic fields (EMFs) can cost several thousand dollars. However, you can make one inexpensively yourself.
Aside from the fact that near-infrared bulbs heat you up more effectively than far-infrared saunas do, near-infrared light (660 and 850 nanometers) also stimulates nitric oxide release and ATP production. I do a 30-minute sauna just about every day that I’m home, followed by cryotherapy (cold thermogenesis) — essentially, I just jump directly into my unheated pool. An alternative would simply to rinse off in a cold shower. If you’re brave, you could do an ice bath.