I have never understood Huel’s stubborn fixation on 400kcal per meal. Who only eats 400 kcal? If you have to make single serving packs, why not at least make it 500 kcal, or better yet, 666.7 kcal, as that would be 1/3 of 2000kcal.
I’ll emphasize my point with this: (most people don’t make shakes of exactly 400 kcal)