Edited

Andreas Moritz says vomiting and feeling sick happens very rarely, mostly in people who don't do any colon cleansing beforehand. Food in the bowels tends to push the oil mixture back into the stomach. He says there's a good remedy for nausea during the night: take either 2 Tbsp. Aloe Vera juice or a HCL tablet. This, he says, closes the esophagus sphincter and the nausea vanishes. Keeping the head higher than the abdomen also helps. If the grapefruit juice tends to make you nauseous, using lemon and orange juice in equal amounts works just as well. The Coke flush is another less-nauseating option.