Perhaps, you've heard some crazy stuff that can help you become fit or get healthier. While it's obvious that some trends are totally outrageous (like extreme fasting), you may not be so sure about others that seem legit (like going gluten-free). That's why we're cutting through the hype on 10 popular health trends. At best, they might be a waste of your time and money. At worst, they may be downright dangerous. Here's the scoop—plus what really works on Fox News channel.

Ear candling

In this alternative treatment, a fabric tube that's been soaked in wax is inserted in the ear and set aflame as a way to remove ear wax. It gets a lot of credit it doesn't deserve, Dr. Rachel Vreeman, assistant professor at Indiana University.

"People often hear this creates vacuum-like suction that will pull bad stuff out of the ear canal, like wax, impurities, congestion from a cold, and toxins," she explained.

Not the case. Research has shown that the candle doesn't create suctioning, plus ear mechanics don't allow for infections or impurities to be "pulled out." Risks include burns and a punctured eardrum. When you've got a wax buildup problem, see your doc—she has special tools that are designed to effectively and safely clear wax from the canal.

Avoiding GMOs

GMO stands for "genetically modified organism." Plants like grains and soybeans may be genetically modified to make them heartier crops. Many people are concerned about their safety risks—there are no long term studies that show they're 100 percent safe—but at the same time, there isn't good evidence that they are harmful or that the food is any different in your body nutritionally, Washington, DC-based registered dietitian Katherine Tallmadge.

If you do want to avoid them, look for foods with the "Non GMO Project Verified" seal. But know this: Some companies use "non GMO" as a marketing ploy. Just because a cracker or cereal doesn't contain GMOs doesn't make it healthy. You'll still have to read the nutrition label and ingredient list to determine if it's a good choice.

Placenta pills

After giving birth, some new moms are getting their placenta encapsulated and popping the pills to boost energy, prevent postpartum depression, increase milk production, and balance hormones. If you're considering it, just know that there's no science to suggest that consuming placenta will stave off childbirth complications or depression, Vreeman said.

Using E-cigarettes to quit smoking

E-cigs are touted as a safer alternative to smoking as well as a promising way to help you quit. Some research suggests they may be as effective as the patch, though a new study in JAMA Internal Medicine found that e-cig use didn't prompt people to change their smoking habits, they weren't more likely to quit or even smoke less.

Cupping

This ancient Eastern medicine treatment involves small glass jars that are placed on the skin (often your back) to create suction. Think of it like a big hickey—it breaks flood vessels underneath the skin to leave a bruise, Vreeman explained. The practice is said to stimulate blood flow and tap into your lymph system to help remove toxins. However, blood vessels and your lymph system aren't actually connected in this way. (Translation: it won't remove toxins.)

"Though some studies show cupping may have some effect, the science isn't good and the trials are at a high risk of bias. We need more research," Vreeman said.

Going gluten-free to lose weight

A gluten-free diet might be necessary for people with celiac disease (who have an immune reaction to the protein found in grains like barley and wheat), but it's become a trendy way to lose weight. The diet often backfires.

"My clients who have gone gluten free are all constipated and nutrient deficient," Tallmadge said. "When we get them back on grains, they feel better."

Oil pulling

This Ayurvedic practice—where you swish a tablespoon of oil (coconut, sesame, sunflower) around in your mouth for 20 minutes—is gaining steam as an at-home remedy. That may be because Gwyneth Paltrow and other stars are fans, saying it keeps their teeth white, breath fresh, and mouths cavity-free. While a few small studies show it can help reduce mouth bacteria as well as regular mouthwash, it's not a replacement for brushing, flossing, and routine dental visits, Rana Stino, a dentist at Water Tower Dental Care in Chicago, said.

The Blood Type Diet

This buzzed-about diet is based on the idea that depending on your blood type, you're more suited to eat some foods and that you should avoid others. For instance, recommended foods might be green vegetables and eggs, but you have to skip dairy and tomatoes. The catch? It's highly restrictive and complicated, making it hard to maintain, not to mention there's no science at all behind it, Tallmadge said. If you want to lose weight and keep it off, you should make changes to your daily habits that are sustainable, like wearing a pedometer to increase your daily steps, filling half your plate with vegetables, and reducing the amount of processed foods you eat.