Photo Caption Onions may be used in weight loss efforts.Photo Credit onion image by Zbigniew Nowak from Fotolia.com
The old adage about an apple a day may apply to the onion too. Both pieces of produce are rich in fiber, nutrients and an antioxidant called quercetin, all of which may contribute to weight loss. Onions also are easy to add to a variety of dishes, bringing the benefit of low-calorie flavoring.
Onions are a good source of the antioxidant quercetin. Quercetin may help increase energy expenditure, or calorie burn, in your body while also reducing inflammation, says Laura K. Stewart, lead author for a 2008 study published in the journal "Metabolism." However, more rigorous research is needed before firm conclusions can be drawn. One problem with many quercetin studies is imprecise information about the amount of compound actually provided, which leads to uncertainty about the effective dose of quercetin needed to gain results, Stewart notes. In addition, your body may adapt to the antioxidant's early effect on energy expenditure, thus reducing its benefit over time, Stewart says. This antioxidant also is found in apples, tea, citrus fruits and red wine, according to University of Maryland Medical Center.