Will a 0.2g/mL sugar concentration cause vomiting in humans?
Sugar (be it sucrose, glucose, fructose or honey) does not have emetic properties in any concentration, unless there is a personal (and highly individual) psychological adverse reaction to sweet substances.


Sugar is not a local gastric irritant (like dishwashing detergent, or syrup of ipecac, copper sulphate, zinc sulphate; yellow mercuric sulphate, ammonium carbonate, powdered mustard and other local gastric irritants.) Some non-irritating substances (e.g. cod liver oil) may induce emesis because of a repugnant smell, taste, or texture. Few people find the taste of sugar repugnant. Gastric distension to the point of emesis does not occur with 12 or 16 oz. of fluid.

Psychological causes of vomiting include aversions (e.g. some people vomit when they see someone else vomit.) That would involve a cerebral cortex mechanism.

No sugar of any concentration is listed here as an emetic. If it were true, we would have a much less significant incidence of obesity.