Early results from US researchers suggests that eating grapefruit really does help people lose weight, and could help reduce the risk of developing diabetes. The "grapefruit groups" also had reduced levels of insulin, the hormone which enables the body to metabolize sugars. Glucose levels were also lower, suggesting a more efficient sugar metabolism.

BUT…if you est TOO MUCH grapefruit, like in your diet, it can be harmful. It is quite an acidic fruit and in theory if you ate too many acidic foods you would eventually upset the delicate acid and alkaline balance that your body has.

What you should be aware of though is that grapefruit and grapefruit juice can interfere with the absorption of medication, and can cause negative side affects if eaten or drunk with medication, or within a short period of time of taking any medication.
However If you’re not on any kind of medication you have nothing to worry about.

As far as Grapefruit helping you to lose weight goes, the main reason behind this is because it is a fruit that really helps to fill you up. Therefore if you eat grapefruit regularly you will eat less food throughout the day and subsequently lose weight.

It doesn’t have any magical fat burning properties, but if you eat half a grapefruit before you have a meal you will eat less of your meal, that’s where the theory that grapefruit helps you to lose weight comes from.

So, Have a look:-

http://Healthcaretips.notlong.com

and you arent eating enough calories