Set (and write down) reasonable expectations for what you plan to achieve during your challenge. “You can absolutely make a difference in 10 days,” says Brooke Alpert, RD, a dietitian in New York City and the author of The Diet Detox, but don’t expect to shed 20 pounds a la The Biggest Loser. “While actual weight loss will be around three to four pounds, you can really notice the difference in the way your body feels in about a week.”
This could be because the body increases insulin secretion in anticipation that sugar will appear in the blood. When this doesn’t happen, blood sugar drops and hunger increases. Whether this chain of events regularly takes place is somewhat unclear. Something odd happened when I tested Pepsi Max though, and there are well-designed studies showing increased insulin when using artificial sweeteners.