Researcher Finds No Evidence That Weight Loss Supplements Are Effective

A U.S. researcher who analyzed data from a variety of weight loss studies has concluded that no evidence exists that any single product results in significant weight loss, and many can be harmful. The researcher looked at studies involving four main categories of products: chitosan, which block absorption of fat or carbs; stimulants such as caffeine or ephedra that increase metabolism; products such as conjugated linoleic acid that claim to decrease body fat; and appetite suppressants such as soluble fibers. “For most people, unless you alter your diet and get daily exercise, no supplement is going to have a big impact,” the researcher said.