Which is better fuel for spinning class — protein or carbohydrates? Should you consume a sports drink on a long run? Is it safe to eat before a workout? Listen to locker room talk at the gym and you'll hear lots of conflicting tips about what you should eat and drink before and after you work out. These answers to five common questions about fueling your workout sort fact from fiction.

One of the most common questions for sports dietitians: "What should I eat before and after a workout?"

Sometimes the answer depends more on the athlete and the specific activity, but there are some common truths that apply for pre- and post-workout nutrition, whether you're a weekend warrior or a seasoned veteran.

Eating protein doesn't equal big muscles. Instead, muscle growth is a complex process that relies on adequate consumption of protein and calories, hormones including human growth hormone and testosterone, and a healthy dose of exercise.

Here are a few facts and tips to keep in mind before you amp up your protein in search of a new physique.