You're eating more and you're lifting weights religiously, but you're still not gaining weight. What gives? Here are four possible reasons you're not gaining weight.

Whey protein provides all the essential amino acids and is easy to digest, although supplemental protein for toddlers usually isn't needed.

Weights fluctuate. Some seasons (ahem, winter), the scale goes up. From time to time, diets and workout routines bring it back down. And, a lot of the time, weight loss doesn’t last.

Barstool Sports “reporter” decided to ponder if a recent photo of mega-babe Rihanna meant that the singer is getting fat. The Internet was not pleased.

A man gains weight by eating more calories than he burns daily. But don't just chow down on donuts and pizza. Eating healthy protein, dairy, whole grains and starchy vegetables will help you look and feel healthier when you need to put on pounds.

Melanin production can increase over time to better protect you from sun exposure. In order to do this, you need to be eating the right foods that provide your body with nutrients used to make melanin.

Here’s a look at how your neighborhood, city or town can influence your eating habits, fitness routine and more.

While you can't make weight gain purposefully go to a specific area of your body, you can try to increase your muscle size in your legs and hips to create a fuller, fitter look.

When your goal is to gain weight, peanut butter is an inexpensive source of high-quality calories. Use it to add nutrition and calories to snacks and meals.

You need extra protein when you're working out to gain muscle. But if you're getting tired of grilled chicken and boiled eggs you might consider taking a protein supplement.

A new study has found that walnuts light up the area of the brain that regulates cravings and hunger. Those who consumed walnuts reported feeling fuller.

From his cut physique in “American Psycho” to his emaciated look in “The Machinist” to his bloated bod for his upcoming role in “Backseat,” we’ve seen Christian Bale completely transform his look numerous times.