re: headaches - I’ve been playing around in the field of “cleanses” and radical dietary changes for the last three years and I can tell you this…if someone who is eating a trash diet…full of sugar and high carb intake which is causing insulin spikes, and toxins in their food, switches on a dime to a formula (whether it be juicing, fasting, diet, or a liquid meal) which does NOT include all the sugar, high carbs, and toxins - headaches are very very likely. (from the withdraw of those things just as much as, in the case of soylent specifically, the increase of much needed nutrients)
re: experimentation is scary - it’s not easy to step outside of mainstream thinking when it comes to our health and our own bodies. Regardless of a lack of scientific data that would suggest that this is an unhealthy route to take, there are still a lot of unknowns, and a LOT of outside pressure (which filters in whether we want it to or not) designed to make us think this is unhealthy, and downright dangerous.
Social conditioning is tough to get around. I’ve been experimenting with my health and body for years now, without the guidance of health professionals. I’ve “fixed” more things than doctors have, up until this point so it wasn’t in the least curious to me that Rob, a guy with no credentials, came up with this idea and then went ahead and implemented it. The first family member I mentioned this too? Their first concern was that he had no credentials.
Funny story sort of related to this - I experimented with Kefir for a while. In case you don’t know what Kefir is, it’s fermented milk. You get these live cultures, put it in milk, and leave it on a counter for 12-24 hours. It’s supposed to be super healthy, and many cultures other than ours consider it a staple in their diets. Not only was I fermenting it, but I was also using farm fresh milk (which even has scientific data to back up how much healthier it is than conventional pasteurized milk). The combination of those two things…two taboos that are SO ingrained into our culture…I was certain I was going to kill myself with my first batch. Who willingly drinks unpasteurized “spoiled” milk??? Many people feel the same way about any fermented food, even though in other cultures, it’s a staple. I think this is kind of like that. While meal replacement drinks may not be big in other cultures, it’s new to us, and therefore for some people, lots of social and cultural taboos to get around when it comes down to the wire.