ATLANTA — As summer temperatures rise, it's important to understand how your body works to keep you cool. Your body has a built-in air conditioning unit: sweat. The normal body temperature is 98.6 ...

Look, I’m gonna be straight with you – those online calculators that tell you exactly how many jumping jacks you need to burn 500 calories? They’re basically making educated guesses about your body.

Most people think of weight loss as a math problem: calories in versus calories out. In reality, your body sees it as a survival threat. When calorie intake falls or body fat decreases, biological ...