Yes. Yes, you can go hiking on slimfast or Weight Watchers. I go hiking all the time in Arizona with a Builder Bar or an apple and some water. 6 to 8 mile trail runs with some water (nothing else) is very common for me and my friends. I am not going to mix up Soylent for trail running or hiking, ever. I can almost say that 99% of my friends will not either.

I also participate (professionally) in uSAR via a technical rescue team for a decently large municipality. We don't take food on call outs and have no idea how long an extrication will take for example. When I am at work, I often don't eat for two, three, or four hours past "lunch time" or "dinner time" due to calls. Soylent is not an option anymore than drinking a protein shake on a call. Not happening.