To be fair, safety is a matter of concentration and exposure. It's not safe, per se, as with any pesticide. The question is about it's lingering effects.
Table salt is safe, but you definetively not want to eat a full glass of table salt. I guess it's fatal.
Sugar is perhaps safe, there is a test for diabetes during pregnancy that consist in drinking a (small) glass of very concentrated sugar solution. I think it's not a full glass, so don't try it without medical doctor authorization and supervision.
A glass of food oil? Does it give you diarrhea?
A glass of alcohol? It's like two glasses of vodka. I think you get alcoholic coma or worse.
Also, the level of purification is different for food/medicine and other applications. Don't try to eat the salt that is sold to clean snow.
Sugar is perhaps safe, there is a test for diabetes during pregnancy that consist in drinking a (small) glass of very concentrated sugar solution. I think it's not a full glass, so don't try it without medical doctor authorization and supervision.
A glass of food oil? Does it give you diarrhea?
A glass of alcohol? It's like two glasses of vodka. I think you get alcoholic coma or worse.
Also, the level of purification is different for food/medicine and other applications. Don't try to eat the salt that is sold to clean snow.