When you eat something loaded with sugar, your taste buds, your gut and your brain all take notice. This activation of your reward system is not unlike how bodies process addictive substances such as alcohol or nicotine -- an overload of sugar spikes dopamine levels and leaves you craving more. Nicole Avena explains why sweets and treats should be enjoyed in moderation.
Periodontal disease affects more people worldwide than any other illness, according to the Guinness World Records. It destroys gum and bone, eventually causing teeth to fall out. Periodontal disease may also be linked to life-threatening illnesses, such as pneumonia and diabetes. One drawback of standard treatments is that it's difficult to restore damaged tissue. But a drug developed in Japan regenerates gum and bone, and saves teeth. We'll also look at ways to maintain good oral hygiene, even when disaster strikes.
Every second of your life you are under attack. Bacteria, viruses, spores and more living stuff wants to enter your body and use its resources for itself. The immune system is a powerful army of cells that fights like a T-Rex on speed and sacrifices itself for your survival. Without it you would die in no time. This sounds simple but the reality is complex, beautiful and just awesome. An animation of the immune system.
From the first row of planted crops, the practice of agriculture rendered man's hunter-gatherer lifestyles obsolete in favor of settled life and stable food supplies. This led to a skyrocketing population and enabled humans to develop skills outside of gathering the food needed to survive.