Making food useful: Glucose

[Sundance]

Seems sensible, but give it negative side-effects: Diabetes, etc.

Makes diabetes exist as an ailment, and insulin (already exists) treat it? Sure, but maybe call it space diabetes because IRL diabetes is pretty permanent.
Also, obesity.

Slightly off-topic, but I also think some medicines should have a negative effect.
Syptic powder should knock someone out if they don't take painkillers beforehand, and silver sulfadine should slow people down marginally as it's drying in.