Many diseases are behavioral diseases such as high blood pressure, diabetes and heart disease. The first step to better health is a trip to your doctor. YNN's Health Reporter Marcia Fraser has more.

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NATIONWIDE -- "If you don't know these numbers basically what happens is you can harming your vital organs, your heart, your brain, your eyes, your kidneys," said Dr. Renate Mazzei, a Family Practitioner.

For optimal health you should know the numbers of certain tests, one test, blood pressure. It's called the silent killer because there's often no symptoms.

"Blood pressure is normal is 120 over 80 is a normal range so we usually start treating if blood pressure over 140 systolic or diastolic 85 or above," said Dr. Mazzei.

1 in 3 adults has high blood pressure it and half do not have it under control, its a major risk factor for heart disease stork congestive heart failure and kidney disease. Numbers that puts you at risk for diabetes are called glucose levels.

"The level of sugar in your body, in your blood stream. If elevated it can cause damage to eye, kidneys, your vital organs, nerve ending. It can be easily done by fasting sugar level and should be below 100," said Dr. Mazzei.

Cholesterol is another set of numbers you need to know.

"Your total cholesterol should be lower than 200 but that is a make up of LDL, the bad cholesterol and the HDL, the good and triglycerides. The LDL is the bad, low density lipoprotein should be below 130 unless you are a cardiac patient or diabetic, then below 100 or ideally 70," said Dr. Mazzei.

Your BMI, body mass index, is the ratio between your height and weight, and your waist circumference and if it's over 25 indicates a degree of obesity. Charts help compute the ratios for you, and the numbers are different for men and women.

Most medical experts say prevention is key, get plenty of sleep, proper diet and regular exercise.