Soylent contains plenty of insoluble fiber so digestion is more or less unchanged.
Fiber in Soylent Powder
Total Fiber: 26.98 g
Insoluble Fiber: 2.6 g
Soluble Fiber: 24.38 g
Fiber in Soylent Drink
Total Fiber: 2.85 g
Insoluble Fiber: 2.15 g
Soluble Fiber: 0.7 g
Fiber in Soylent Bar
Total Fiber: 5 g
Insoluble Fiber: 2 g
Soluble Fiber: 3 g
Fiber in Coffiest
Total Fiber: 2.85
Insoluble Fiber: 2.06
Soluble Fiber: 0.79