Sushi fans, listen up. Eel (aka unagi) might be delicious, especially when wrapped up in your favorite roll, but you might want to order it on special occasions only. April Patterson, D.D.S., cosmetic dentist and owner of Dr. Patty's Dental Boutique and Spa in Fort Lauderdale, Florida, thought eel was delicious, but that all changed when she discovered they were bottom feeders.

"Whenever an animal dies in the water, its body slowly sinks to the bottom, decaying and decomposing into a rotting husk until it hits the bottom," she explains. "Once it does, this is when bottom feeders, like eels, chew up whatever remains and then onto the next."

If this doesn't perturb you, here's something that might. Biomagnification, or the process by which toxins and other poisonous substances grow and accumulate as one critter eats another, can be dangerous, especially when mercury plays a role (i.e. tons of mercury-clad dead fish being eaten up by eel). What makes eel worse than the other mercury-containing fish you eat? To start, eels are known to contain very high levels of mercury. "Mercury is linked to abnormal fetal development and is extremely harmful to your central nervous system," Dr. Patterson says. "Not only that, but it can have severe effects on your teeth, mouth and gums."

More so, eels are currently produced in unsustainable fisheries. This means that eel farms are highly polluted, overcrowded and just petri dishes of gross things to make a corpse-eating fish even more nasty, Dr. Patterson explains. Did we mention that eel blood is poisonous to humans? Raw eel blood can have some devastating effects on your health. "Although the poisonous effects of eel blood are neutralized when cooked (hence why unagi in sushi isn't served raw, but broiled), it still says a lot about the fish and its diet whose blood is poison," she says. If you still crave the smooth and slimy texture, Dr. Patterson recommends squid instead. "Squid is a great source of protein, has zero carbs and is rich in antioxidants that can play a role in preventing cancer."

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You've heard that regular soda is full of empty calories (not to mention sugar). It also provides zero nutrition whatsoever, and doctors will be the first ones to give you the 411 on this information. "The sugar in regular soda, high fructose corn syrup, is an artificial sugar which is not found in nature and is linked to obesity and weight gain," says Chris Thiagarajah M.D. oculoplastic surgeon at Park Avenue Oculoplastics in Denver, Colorado. Chugging a can of soda gives you a quick insulin rush, but soon after your blood sugar levels are low, and you're often left hungry.

Diet soda is even worse. "Because of the sweet taste, there is an insulin surge in your bloodstream, but, in reality, you have not consumed any sugar at all," explains Dr. Thiagarajah. Instead, that sweetness comes from an artificial sweetener known as aspartame, which is linked to a slew of health concerns including headaches, dizziness, lack of focus and fatigue. Additionally, aspartame has been linked to overeating, therefore increasing the risk of weight gain and obesity, two factors that are linked to heart disease and cancer.

Instead, make water or sparkling water your beverage of choice. And, if you're really craving a sweet drink, Dr. Thiagarajah recommends reaching for something with a natural sugar, such as agave, which doesn't raise the blood sugar as much as soda.

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If it's fruit that means it's healthy right? Oh, so wrong -- especially when a fruit is canned in syrup. Otherwise known high fructose corn syrup, this highly processed, unnatural additive is terrible in concentrated doses. "Humans use glucose primarily for energy, but we don't need fructose and were certainly not meant to ingest large doses of it," explains Kristine Arthur, M.D., internist at Orange Coast Memorial Medical Center in Fountain Valley, California. "Fructose has to be metabolized almost entirely by the liver and over time, this causes fatty liver and elevated triglycerides, which can eventually lead to advanced liver disease and coronary artery disease."

Additionally, because it is contains such a concentrated form of sugar, canned fruit tends to be very calorie-dense, as well as being empty calories. "Fructose does not stimulate insulin production like glucose, which may be one reason why eating it does not cause the satiety we would expect after eating carbohydrates," says Dr. Arthur. Basically, this means that you may crave more sweets, but never feel satisfied. Her advice is to read labels carefully and opt for fruit in its natural state or fruit that is canned in natural juice instead.

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If you're someone who invests in a strict (and expensive) skin care regimen that requires a great deal of upkeep, you may want to make sure your diet is compliant. One thing to nix is milk -- particularly skim. "Cow's milk in general has been linked to worsening of acne, but the greatest association is with skim milk," says Joshua Zeichner, M.D., director of cosmetic and clinical research at Mount Sinai Hospital in New York City. In fact, one study, published in the Journal of the American Academy of Dermatology, supports this correlation. Researchers found a link between those who drank skim or low-fat milk and acne, but did not find the same for those who drank full-fat milk.

Dr. Zeichner notes that another theory as to why cow's milk may cause breakouts is that hormones from the lactating cow may be transferred to the milk and ultimately stimulate our oil glands when we drink it. "Sugar has also been associated both with premature skin aging and acne breakouts," he explains. "High sugar levels in the blood promote inflammation that cause acne flares in predisposed individuals."

Additionally, he explains that high sugar levels leads to a process called glycation, where the sugar attaches to collagen leading to hardening of the collagen itself and early wrinkling. "While I know I shouldn't be having too much sugar, I have to admit it's difficult to resist taking a lick of my kids' ice cream cones."

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These quick and easy breakfasts might pack a flavor punch, but they're sorely lacking in nutrition and are overloaded with calories to boot. In fact, one measly Pop-Tart can cost you around 200 calories, depending on your choice of filling (and who stops at just one?). Additionally, the standard Pop-Tart contains around 28 grams of carbs and only 2 grams of protein, so they're guaranteed to leave you hungry in a matter of an hour. "Foods containing way more carbs than protein tend to be digested more quickly, elevate insulin and blood sugar levels quickly, and leave you hungrier than foods that have a bit more balance with carbs and protein," says Roger Adams. Ph.D., Houston-based dietitian and nutritionist and founder of eatrightfitness.com. "This can lead to overeating, as you try to compensate for the speed at which these types of food digest."

A better quick choice in the morning, one that will leave you more satisfied and is equally as quick, is a simple fold-over peanut butter sandwich with raisins or apple slices added to it. "This gives you a much better balance of carbs, fats, and protein, healthy fats, fiber (if you use whole-grain bread and don't peel the apple)," says Dr. Adams. "Just go easy on the peanut butter, as it is calorie-dense -- one to two teaspoons should keep you fueled well into the morning and prevent mindless work snacking!"

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