Do you want to know if you are too fat, you have serious problems with your health? A group of doctors wrote a report about some of effects of too much fat. One important effect is on the heart. If you are fat, your heart has to work harder. This may lead to a heart attack or it may lead to other heart problem. In addition, extra fat can also change the amount of sugar in your blood. This can cause serious disease such as diabetes. Furthermore, high blood pressure is another possible result of being fat. More studies are needed about all these problems but one thing is clear, extra fat may make your life shorter.

Which one is not correct according to the text?