Grapefruits
 

GRAPEFRUIT
A study from the Scripps Clinic (San Diego, California) reported that subjects eating half of a grapefruit or drinking 8 oz of grapefruit juice three times a day while maintaining their normal diet lost an average of 4 pounds over 12 weeks - and some lost more than 10 pounds without even dieting!

Results were likely due to grapefruit's ability to reduce insulin levels and to a chemical in grapefruit known as naringin, which prevents fat from being stored in the body.