Papaya is one of the richest sources of Antioxidants up to twenty times more powerful than Vitamin E. Recent studies also show it could help prevent and fight cancer.
Papayas are rich in protein digesting enzymes, such as Papain, which offer enormous benefits to digestive health. As digestive health and immunity decline as we age, papayas have been recognised as an excellent anti-ageing fruit. Green papayas are natural cleansers as the high concentration of enzymes can dissolve debris, mucus and old tissue.

There is also a definite correlation between weight loss and papaya enzymes.

Papayas contain Papain a digestive enzyme which is documented to be antibacterial, antifungal and antiviral.
Papain is able to break down and help digest meats and proteins. It's utility is in breaking down tough meat fibres and this is essential in a weight-loss regime. There are two more enzymes that assist weight loss.
Alpha Amylase helps break down and digest starches and carbohydrates. It breaks large, insoluble starch molecules into soluble starches - producing successively smaller starches and ultimately maltose.
Protease enzymes are effective at breaking down and processing protein. Protease enzymes are very important in digestion as they breakdown the peptide bonds in the protein foods to liberate the amino acids needed by the body.