Popcorn during a movie is like leftover sandwiches after Thanksgiving. Sure, you don't really need to continue stuffing yourself, but doesn't it just feel right? Well, hold on to your hats -- you may never stop at the cinema snack counter again after this study from the non-profit Center for Science in the Public Interest.

According to CSPI's research, a medium popcorn and soda combo at Regal -- the country's biggest movie theater chain -- contains 1,610 calories and three days' worth of saturated fat. For that amount of fat and calories, you may as well scarf down three McDonald's Quarter Pounders (1,640 calories) or slam 16 pats of butter at 1,632 calories.

CSPI analyzed popcorn samples from three of the largest movie theater chains in America -- Regal, AMC and Cinemark. Out of the three, Regal and AMC fared the worst.

We all could use a little metabolism boost from time to time, but did you know that certain foods can rev up your metabolism?

It's true, jalapeno, habanero and cayenne peppers speed up the heart rate with natural capsaicin, but you don't need to sacrifice your taste buds for some extra calorie-burn.

Some fat burners, such as milk, whole grain cereal and oats, won't leave you sweating. They even do double-duty by giving you the vitamins and nutrients you need while pumping up metabolism and keeping insulin levels down even after you eat -- insulin spikes send the body a message that it's time to start storing fat.

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Cravings tend to ebb and flow throughout the day. One minute you're jonesing for something sweet; the next, all you want is to get your hands on a bag of salty potato chips. Yielding to either craving can be enough to derail any diet, so the trick is to keep your portions (and calories) down while satiating your sweet or salty needs.

AOL Health is here to give you a leg up on low-calorie savory snacks. Cure cravings and keep your diet in check by reaching for 100-calorie snack packs or choosing healthy alternatives, such as fiber-filled edamame or freshly popped popcorn.

Need something sweet instead? That's Fit helps you cure those sugar cravings.

To say that we're all busy these days is somewhat of an understatement. Whether it's thumbing the BlackBerry well into the night, shuttling the kids to soccer and piano practice or trying to keep up with the housework, we all have our unique time sucks that eat away at the day. AOL Health knows how busy you are and how important it is for you to stay fit, which is why this 15-minute workout is worth a look.

You don't have to spend hours upon hours at the gym to create a sculpted body. Just 15 minutes a day, three times a week is enough to ramp up calorie burn and start getting those muscles toned . These seven simple moves can be done in your own home and allow you to get your body in shape without sacrificing your daily routine.

As the day progresses, you lose time (and motivation) to work out. Find out how to get a morning jumpstart on a healthy routine.

Need an excuse to dial back your workouts? Well, ladies, you've got it. New research from the Norwegian University of Science and Technology found that the risk of infertility was more than three times great for women who exercised to the point of exhaustion compared to those who exercised moderately.

Smoking, stress, alcohol and being extremely under or overweight can all affect a woman's chances of becoming pregnant, but elite athletes seem to have a more difficult time conceiving compared to other women. According to researchers, extreme physical activity seems to be partially to blame.

The 10-year study followed 3,000 women who were healthy and in their childbearing years from the 1980s to 1990s. Those who trained every day to exhaustion -- 24 percent of the subjects -- had the highest risk of infertility. "When we compared those who trained to exhaustion to those who trained more moderately, we found that the first group had a three-fold greater risk of impaired fertility," said study author Sigridur Lara Gudmundsdottir, a Ph.D. candidate in NTNU's Human Movement Science Program.

We all know that there are certain foods you should stay away from when dieting. The list usually goes something like this: All of your favorites. Okay, that's a little extreme, but there are foods that don't necessarily scream weight loss that are actually not so bad for you. For example, the three P's (pizza, potatoes and pasta) are usually the first to go on our list, but according to AOL Health, keeping them in your meal rotation won't destroy your diet.

Here's why: By ordering only half the cheese on a thin-crust pizza and piling on fiber-rich greens, such as broccoli and spinach, you can create a healthy dinner that isn't kryptonite to your diet. A medium-sized potato has 161 calories and no fat. It's packed with vitamins, minerals and has a high-fiber content to keep you satiated. One cup of spaghetti has 221 calories, which really isn't so bad. Toss in your favorite steamed vegetables, and you've got a perfect, nutrient-dense meal that won't sabotage your waistline.

Are you guilty of falling for a diet fad? Check out some of these crazy diets through the decades.

They say ignorance is bliss, so it's often easier to indulge in an unhealthy snack or meal when you don't know exactly how much exercise you would need to do to burn it off. Sure, some of you might say, "I don't care. I deserve to indulge." But we know that some of you would be horrified to know that you'd need to walk for more than five hours to burn off a Ruby Tuesday's Turkey burger, which weighs in at 1,173 calories. Or how about the ultimate indulgence for some people -- McDonald's fries? If you knew you'd have to walk for almost two hours to burn off 350 calories from a medium serving, would you still belly up to the drive-thru?

We challenge you to take this quiz from AOL Health. Test your knowledge of calorie counts in some of our favorite foods and see if they're worth the workout.

Fallen off the workout wagon because of a time crunch? Get back on track and save time with circuit training.

There are two exercise camps. The first is made up of people who take a Zen-like approach to working out, preferring to be left alone with their thoughts while pumping iron or hauling it on the treadmill. The second is for those who rely on steady beats of their favorite song to pull them through that last rep or mile. If you're a thoughtful exerciser, more power to you, but new research shows that jamming out while you're working out can actually increase your endurance.

Researchers found that syncing music tempo with your exercise pace can actually increase your work out efficiency. Running on a treadmill to a song that matches your cadence can result in a 10 percent reduction in perceived effort, which allows you to work out longer, reports LiveScience.

Additionally, a study published in the Journal of Sport and Exercise Psychology found that running in time with a song that had 125 beats per minute (bpm) helped increase endurance by 15 percent.

It's 3 p.m. You're staring at the monitor, eyes partially glazed over, drifting dangerously between consciousness and dead sleep. Before your head hits the desk, you lurch out of the chair and careen toward the coffee machine. We've all been there. It's the dreaded energy crash.

When afternoon exhaustion kicks in, the first thought is to grab a cup of coffee or can of Diet Coke in an attempt to power through the rest of the day. But even in all of its energizing glory, caffeine can not only leave you feeling shaky and jittery, but it can also affect sleep patterns. So instead of just reacting to an energy crash, you can be proactive by preventing afternoon fatigue through the foods you eat. Whether it's staying away from the vending machine or learning how to balance protein and carbs, AOL Health gives you the advice you need to help you get through the day.

Are you an energy drink junkie? Find out what you're really putting in your body, here.

Halloween is right around the corner, and we all know the best part isn't really dressing up: It's the Halloween candy. Whether you go to town on anything and everything chocolate, or hold a special place in your heart for gummier fare, the hardest part about this goulish holiday is remembering that "fun size" doesn't necessarily mean "fun for the waistline."

While it's true that calorie and fat counts differ for each candy, nutrition labels are hard to find (or often don't even exist) on these Halloween-friendly miniatures. That's why AOL Health has created a handy Halloween Candy Quiz to help you take the guesswork out of picking through your plastic pumpkin and prevent a major diet disaster from happening.

That's Fit wants to know how much Halloween candy you'll allow yourself this year.