Lipids are absorbed from the food you eat or manufactured in your body. Because these fats do not dissolve in blood, they are transported through your bloodstream to the tissues of your body as particles called lipoproteins. HDL and LDL are 2 of the 5 major classes of lipoproteins.

Pregnancy is an intricate development of cells which multiply and eventually form a baby. Hormones play a complex role in this metamorphosis and assist physicians in determining the healthy progression of a pregnancy or potential problems.

The brain is a complex system of neurons that communicate through the release and uptake of chemicals known as neurotransmitters. Two of these neurotransmitters, serotonin and dopamine, play an important role in the regulation of mood, sleep, appetite, movement and posture.

Pizza is one of those foods that can either be a healthy treat or violate all of your dietary guidelines. If you're buying pizza from one of the popular fast food chains, you're probably exceeding your daily allotments for fat, saturated fat, sodium and calories.

Hyperuricemia, an abnormally high level of uric acid in your body, can cause a type of kidney stone and exacerbate gout if excess uric acid forms painful crystals in joints. High cholesterol levels may be associated with the uric acid levels in your body, although more scientific evidence is needed to confirm a link.

Estrogen refers to a group of hormones present in the female body: estradiol, estriol and estrone. During the course of your life, the levels of these estrogen hormones fluctuate. They help to regulate your menstrual cycle and are also key in supporting and maintaining a healthy pregnancy.

While a blood test to determine your cholesterol level can be done anytime, for the most accurate results it is best to fast. Different foods such as fatty foods have varying effects on cholesterol levels and if you test too close to eating, you may not get accurate results.