I am a Farrell’s nutrition coach. I know the program fairly well. In the program, I can’t recommend Soylent, and I do try to steer users away from prebottled protein shakes, bars, and other drinks of that type. However, I actually use Soylent, myself, for at least a meal a day. We also allow for shakes and bars when needed. Because good nutrition regularly is more important. So better to eat a bar or shake than to skip a meal.
When I went through my 10 weeks, I used Soylent. My coach was more open to it. Generally most people in this line don’t understand Soylent, so it is up to you.
I won my 10 weeks…
It is hard to say how to approach this, because nutrition coaches are different everywhere. You can put your foot down on it, but it could affect their decision when it comes to the challenge winner.