I actually see this claim/worry relatively frequently.. i wish someone would actually address it.
Note that i've bought a full month of it already, so it's not stopping me.. i'd just like actual conversation on the subject heh
High carbohydrate diets can over time lead to insulin resistance which can lead to type 2 diabetes. Soylent has 225 net (total minus fiber) grams of carbohydrates, 15 grams of fat, and 114 grams of protein in your daily serving. 225 is high but not outrageous.