Protein poisoning happens because your body has a limited capacity to process protein. It's very high and you're unlikely to hit it, but it's happened to people

Protein poisoning happens because your body has a limited capacity to process protein. It's very high and you're unlikely to hit it, but it's happened to people living off the land and eating nothing but lean meat. Carbohydate processing is not inherently rate-limited like that. How much you need is dictated by how much you use. Even the stated numbers here about 9 weekly 8 oz drinks with 50 kcals or more per serving is comically miniscule compared to what is ingested with no ill effects by any serious endurance athlete who actually needs and uses that much energy. Carbohydrate only has a deleterious effect when you ingest more than you use, which is not characteristic of a poison.