Examiner.comCameron Diaz tells Dr. Oz about 'Body Book' weight loss tips; fat ...Examiner.comIn addition, Dr. Oz considers matcha tea to be effective for weight loss, because it blocks fat and prevents it from being absorbed. It's available as a powder, such as Matcha Green Tea Powder, or in tea bags, such as Kirkland Signature Ito En Matcha ...